# A145301 (b-file synthesized from sequence entry)
0 1
1 6
2 42
3 324
4 2628
5 21816
6 182952
7 1540944
8 13002768
9 109804896
10 927575712
11 7836761664
12 66213868608
13 559463573376
14 4727146822272
15 39941854665984
16 337487851323648
17 2851598575904256
18 24094547371141632
19 203586611176571904
20 1720202912984613888