# A047686 (b-file synthesized from sequence entry)
0 1
1 3
2 90
3 2835
4 18900
5 66825
6 1915538625
7 127702575
8 186080895000
9 350813659321125
10 7656647326453125
11 3018906660144375
12 1211517431782539131250
13 144228265688397515625
14 564653660170076273671875
15 84913182070036240111050234375
16 499921764568178729658131250000