# A081051 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 -6
4 35
5 -225
6 1624
7 -13132
8 118124
9 -1172700
10 12753576
11 -150917976
12 1931559552
13 -26596717056
14 392156797824
15 -6165817614720
16 102992244837120
17 -1821602444624640
18 34012249593822720
19 -668609730341153280
20 13803759753640704000
21 -298631902863216384000