# A259364 (b-file synthesized from sequence entry)
0 0
1 18
2 93312
3 4737042
4 51775488
5 263351250
6 807055488
7 1609827282
8 1934917632
9 774840978
10 691920000
11 20514061458
12 126428055552
13 496767242322
14 1543426109568
15 4122612551250
16 9879830396928
17 21788831695122
18 44962051370112
19 87830997546258
20 163819480320000