# A273878 (b-file synthesized from sequence entry)
0 1
1 4
2 3
3 48
4 40
5 1440
6 1260
7 8960
8 72576
9 7257600
10 6652800
11 958003200
12 889574400
13 11623772160
14 163459296000
15 41845579776000
16 39520825344000
17 12804747411456000
18 12164510040883200
19 231704953159680000
20 4644631106519040000