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A228883 as a simple table

na(n)
11
21
34
422
5150
61173
710148
894925
9945972
109941558
11109382042
121253180343
1314889508598
14182880186850
152316222358948
1630188514546787
17404233232273788
185553341502305868
1978182001588059148
201126836634877469526
2116612944202665079800
22250345193073480290120

[1,1,4,22,150,1173,10148,94925,945972,9941558,
 109382042,1253180343,14889508598,182880186850,
 2316222358948,30188514546787,404233232273788,
 5553341502305868,78182001588059148,
 1126836634877469526,16612944202665079800,
 250345193073480290120]