# A307725 (b-file synthesized from sequence entry)
0 0
1 1
2 1
3 2
4 8
5 38
6 234
7 1670
8 13730
9 126050
10 1286506
11 14374806
12 174922742
13 2299332974
14 32498831162
15 491302184254
16 7913576956058
17 135291701108082
18 2447171221364738
19 46693007367175606
20 937331324424610142
21 19748487304680389214
22 435735970210393888898
23 10048153760813576981702