# A090694 (b-file synthesized from sequence entry)
1 1
2 0
3 3
4 3
5 20
6 120
7 210
8 3640
9 5264
10 211680
11 609840
12 11517660
13 68262480
14 1000359360
15 14082868800
16 89182613520
17 2391049140480
18 13726429516800
19 503669982816000
20 2561900746204800
21 134281295242698240
22 983641429745694720