# A235536 (b-file synthesized from sequence entry)
0 1
1 4
2 140
3 7084
4 420732
5 27343888
6 1882933364
7 134993766600
8 9969937491420
9 753310723010608
10 57956002331347120
11 4524678117939182220
12 357557785658996609700
13 28545588568201512137904
14 2298872717007844035521848
15 186533392975795702301759056