# A006773 (b-file synthesized from sequence entry)
1 0
2 1
3 5
4 30
5 186
6 1164
7 7344
8 46732
9 299604
10 1932900
11 12537542
12 81705782
13 534663812
14 3511466838
15 23136724382
16 152888000934
17 1012925595468
18 6726766841438
19 44767880394634
20 298522284224824
21 1994187071224056
22 13343458013982572
23 89420609914983270
24 600088861692380354
25 4032377457462571694
26 27129080022839863318
27 182726605700552001998