# A051546 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 24
4 431
5 7155
6 117454
7 1961470
8 33775244
9 603682596
10 11235811536
11 218055250512
12 4413843664416
13 93156324734304
14 2048591287486080
15 46898664421553280
16 1116592842912341760
17 27618683992928743680