# A009724 (b-file synthesized from sequence entry)
0 2
1 24
2 720
3 120960
4 1209600
5 95800320
6 1307674368000
7 597793996800
8 10670622842880000
9 10218188434341888000
10 802857662698291200000
11 56404400157567221760000
12 1693824136731743669452800000