# A009700 (b-file synthesized from sequence entry)
0 0
1 2
2 16
3 432
4 23168
5 2039040
6 265344000
7 47773128704
8 11359970459648
9 3446710775119872
10 1299134788619468800
11 595445934379289804800
12 326113437715996197519360
13 210324874581761164037849088