# A337352 (b-file synthesized from sequence entry)
0 1
1 20
2 524
3 19660
4 854380
5 40304080
6 2004409236
7 103440770760
8 5486614131756
9 297239307415792
10 16376472734974384
11 914734188877259884
12 51680064605716043636
13 2948046519564292501232
14 169560941932509940657016
15 9822377923336683964009296
16 572554753384166308597716396