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A213643 as a simple table

na(n)
11
22
318
4252
54940
6124350
73823722
8138915560
95822192952
10276522143130
1114677209803630
12860990013672492
1355315008281020644
143862656545279925302
15291301089508829138130
1623595204076694940812880
172042970533426395737658352
18188298566037963463789282482

[1,2,18,252,4940,124350,3823722,138915560,
 5822192952,276522143130,14677209803630,
 860990013672492,55315008281020644,
 3862656545279925302,291301089508829138130,
 23595204076694940812880,2042970533426395737658352,
 188298566037963463789282482]