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A141381 as a simple table

na(n)
11
21
34
426
5202
61786
717296
8179826
91980484
1022895120
11276005616
123452880648
1344660161656
14595491975516
158166748417744
16114983040461254
171659471907641924
1824519436191927936
19370506958317854776

[1,1,4,26,202,1786,17296,179826,1980484,22895120,
 276005616,3452880648,44660161656,595491975516,
 8166748417744,114983040461254,1659471907641924,
 24519436191927936,370506958317854776]