# A061136 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 3
4 12
5 40
6 120
7 336
8 2128
9 13392
10 118800
11 850960
12 6004416
13 38408448
14 260321152
15 1744135680
16 17067141120
17 167200393216
18 1838196972288
19 18345298804992
20 181218866222080
21 1673804042803200
22 16992835499329536