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Table 1 Number of compositions and sequences comprised of 20 letters, of length not greater than L, for L ranging from 3 to 10, and their ratios (rounded)

From: A parallel method for enumerating amino acid compositions and masses of all theoretical peptides

Length of Peptides (L) Number of Compositions (A) Number of Sequences (B) Ratio B/A
3 1,770 8,420 5
4 10,625 168,420 16
5 53,129 3,368,420 63
6 230,229 67,368,420 293
7 888,029 1,347,368,420 1,517
8 3,108,104 26,947,368,420 8,670
9 10,015,004 538,947,368,420 53,814
10 30,045,014 10,778,947,368,420 358,760