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A056147 as a simple table

na(n)
11
21
34
418
548
6360
7450
86174
927000
1034200
1193250
121776566
1311293824
14172014648
151296688778
1620393895570
17173895132784
183328106382492
1911622794050422
20287786755919610
21709366149217940
2217019652496034468
23198351459813601270

[1,1,4,18,48,360,450,6174,27000,34200,93250,
 1776566,11293824,172014648,1296688778,20393895570,
 173895132784,3328106382492,11622794050422,
 287786755919610,709366149217940,17019652496034468,
 198351459813601270]