# A187740 (b-file synthesized from sequence entry)
0 1
1 6
2 85
3 1650
4 40500
5 1200000
6 41625000
7 1653750000
8 74025000000
9 3685500000000
10 201993750000000
11 12084187500000000
12 783523125000000000
13 54729675000000000000
14 4097124281250000000000
15 327237848437500000000000
16 27775310062500000000000000
17 2496585341250000000000000000