# A009381 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 1
4 -2
5 25
6 -136
7 761
8 -4752
9 42065
10 -386176
11 3898321
12 -42551552
13 521329705
14 -6816879616
15 96017526281
16 -1446339889152
17 23356125062945
18 -399659935891456
19 7240133620964641
20 -138393644469911552
21 2786977252450841785