# A005399 (b-file synthesized from sequence entry)
0 1
1 6
2 48
3 408
4 3600
5 42336
6 781728
7 13646016
8 90893568
9 -1798204416
10 70794720768
11 7538546211840
12 63813109782528
13 -12977417912045568