# A012648 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 8
4 -240
5 17952
6 -1948608
7 295020672
8 -59798806272
9 15680355451392
10 -5172616470494208
11 2098138466506967040
12 -1026884688371863449600
13 596895972998821973729280
14 -406569645650910092250562560