# A013259 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 1
4 -6
5 23
6 -135
7 824
8 -6580
9 56853
10 -574245
11 6321434
12 -77709654
13 1034820863
14 -15028496483
15 234652617016
16 -3939397037160
17 70561239939417
18 -1345864598250633
19 27205562970320606
20 -581454141374015770