# A013187 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 1
4 -4
5 25
6 -120
7 761
8 -5024
9 42065
10 -378240
11 3898321
12 -42905344
13 521329705
14 -6794511360
15 96017526281
16 -1448243646464
17 23356125062945
18 -399450070548480
19 7240133620964641
20 -138422733355024384