# A013431 (b-file synthesized from sequence entry)
1 0
2 1
3 15
4 495
5 29575
6 2805075
7 387547875
8 73496998575
9 18322452939375
10 5810121991600875
11 2283796491396190875
12 1089828106992320070375
13 620645663306405750934375
14 415796249727049685923771875
15 323721378608985101109612121875
16 289840773808099328924207553609375