mod\seq	1	2	3	4	5	6	7	8	9	10
0	1	1	1	1	1	1	1	1	1	1
1	2	4	8	16	32	64	128	256	512	1024
2	4	16	64	256	1024	4096	16384	65536	262144	1048576
3	8	64	512	4096	32768	262144	2097152	16777216	134217728	1073741824
4	16	256	4096	65536	1048576	16777216	268435456	4294967296	68719476736	1099511627776
5	32	1024	32768	1048576	33554432	1073741824	34359738368	1099511627776	35184372088832	1,12589990684262E+015
6	64	4096	262144	16777216	1073741824	68719476736	4398046511104	281474976710656	1,8014398509482E+016	1,15292150460685E+018
7	128	16384	2097152	268435456	34359738368	4398046511104	562949953421312	7,20575940379279E+016	9,22337203685478E+018	1,18059162071741E+021
8	256	65536	16777216	4294967296	1099511627776	281474976710656	7,20575940379279E+016	1,84467440737096E+019	4,72236648286965E+021	1,20892581961463E+024
9	512	262144	134217728	68719476736	35184372088832	1,8014398509482E+016	9,22337203685478E+018	4,72236648286965E+021	2,41785163922926E+024	1,23794003928538E+027
10	1024	1048576	1073741824	1099511627776	1,12589990684262E+015	1,15292150460685E+018	1,18059162071741E+021	1,20892581961463E+024	1,23794003928538E+027	1,26765060022823E+030

Horizontal listed is the sequence lenght.
Vertical listed is the number of modifications.

For fast calculations try to generate not more than 4096 different peptides.

Sequence length	max Number of Modifications for each amino acid
1	12
2	6
3	4
4	3
5-6	2
7-12	1