# A368893 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 30
4 288
5 3500
6 51876
7 908607
8 18374656
9 421492491
10 10815040000
11 306944040931
12 9547373318400
13 322972830958648
14 11805432990665664
15 463673398064821875
16 19474259980847153152
17 870954834559130974358
18 41323803842611198131264