# A002735 (b-file synthesized from sequence entry)
1 4
2 14
3 56
4 331
5 1324
6 12284
7 49136
8 663061
9 2652244
10 49164554
11 196658216
12 4798037791
13 19192151164
14 596372040824
15 2385488163296
16 91991577140521
17 367966308562084
18 17244625801225094
19 68978503204900376
20 3861296322290987251