# A012738 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 0
4 -3
5 0
6 45
7 504
8 2457
9 24384
10 161625
11 2375296
12 20549397
13 338479232
14 3457938757
15 64501554688
16 772773915313
17 16130341302272
18 221864504883633
19 5112670099460096
20 79479234590193325
21 2003580047549120512