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A226990 as a simple table

na(n)
121
2313
32820
424158
5180712
61187869
76897735
835818171
9168412446
10725322952
112890248513
1210747422169
1337565694126
14124186120157
15390330632256
161171738349385
173372578086357
189339039810942
1924954235842112
2064510189847669

[21,313,2820,24158,180712,1187869,6897735,
 35818171,168412446,725322952,2890248513,
 10747422169,37565694126,124186120157,390330632256,
 1171738349385,3372578086357,9339039810942,
 24954235842112,64510189847669]