# A012994 (b-file synthesized from sequence entry)
0 1
1 4
2 8
3 310
4 4600
5 695450
6 32209900
7 9441571750
8 1024927826000
9 439344864507250
10 96071120715212500
11 52160549887581638750
12 20873814687864446035000
13 13171711293701017616406250