# A155663 (b-file synthesized from sequence entry)
0 1
1 16
2 144
3 1240
4 10656
5 91816
6 793584
7 6880120
8 59823936
9 521638216
10 4560526224
11 39970994200
12 351149013216
13 3091621642216
14 27274838966064
15 241075504183480
16 2134495165562496
17 18928981513351816
18 168109033806481104