# A003734 (b-file synthesized from sequence entry)
1 0
2 260
3 27420
4 2504560
5 223723080
6 19923617840
7 1773563554900
8 157870122686600
9 14052371971981100
10 1250831588811052320
11 111339169110472830220
12 9910535055491682625400
13 882157695038695625086700
14 78522722964255506997330800
15 6989473714324564174042717340