# A081054 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 4
4 31
5 288
6 3272
7 43580
8 666143
9 11491696
10 220875237
11 4681264432
12 108475235444
13 2728591657920
14 74051386322580
15 2156865088819692
16 67113404608820943
17 2221948578439255200
18 77990056655776149179