# A012753 (b-file synthesized from sequence entry)
0 0
1 2
2 4
3 398
4 10344
5 1808442
6 161718060
7 45246852870
8 8895239749200
9 3696108480038130
10 1280274899653919700
11 747254995555318476030
12 400947704397371982315960
13 314940075899759001168711210