# A261047 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 40
4 212
5 1248
6 8400
7 63576
8 540858
9 5132564
10 53952742
11 623324184
12 7855144818
13 107224120980
14 1575511525794
15 24784246515256
16 415435624535225
17 7389692971336602
18 138992875726543381
19 2755750468146310688
20 57433108983590606292