# A144340 (b-file synthesized from sequence entry)
0 1
1 4
2 52
3 712
4 13464
5 299520
6 8455392
7 273091392
8 10372138560
9 443940231168
10 21373226590464
11 1136301643620864
12 66301616889414144
13 4203565310173630464
14 287934809159520681984
15 21176025476308764622848
16 1664420505612432224993280
17 139202656243140427345723392