# A013990 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 16
4 800
5 323632
6 1086297184
7 30766606427588
8 7466577706821521924
9 15681997226277809235573754
10 286995508313697459220070082104780
11 45988915870193885369543805313062149050276