# A090765 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 6
4 12
5 24
6 40
7 1008
8 3360
9 362880
10 181440
11 39916800
12 15966720
13 6227020800
14 32947200
15 261534873600
16 373621248000
17 2845499424768
18 88921857024000
19 121645100408832000
20 1422749712384000
21 3005349539512320000
22 10218188434341888000
23 25852016738884976640000