# A012488 (b-file synthesized from sequence entry)
0 1
1 -4
2 60
3 -2056
4 127376
5 -11253504
6 1524986944
7 -257629834112
8 60842617280768
9 -16737691854400512
10 6112605714322803712
11 -2481449664133693548544
12 1299422306103439813611520