# A091481 (b-file synthesized from sequence entry)
1 1
2 2
3 12
4 112
5 1450
6 23976
7 482944
8 11472896
9 314061948
10 9734500000
11 336998573296
12 12888244482048
13 539640296743288
14 24552709165722752
15 1206192446775000000
16 63633506348182798336
17 3587991568046845781776
18 215334327830586721473024
19 13705101790650454900938688