# A108034 (b-file synthesized from sequence entry)
4 0
5 400
6 13280
7 278880
8 5120640
9 90518400
10 1602720000
11 28966291200
12 539568691200
13 10411578777600
14 208646710272000
15 4347290787840000
16 94201374339072000
17 2122386883448832000
18 49691667829579776000
19 1208138588893716480000
20 30476152489092710400000
21 796939223079733493760000