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A255657 as a simple table

na(n)
13340
211752
342653
4155144
5564600
62036844
77323894
826452984
995690028
10345980784
111250385422
124516046380
1316313317592
1458952879320
15213036643465
16769783313248
172781411265212
1810049660711008
1936312457046956

[3340,11752,42653,155144,564600,2036844,7323894,
 26452984,95690028,345980784,1250385422,4516046380,
 16313317592,58952879320,213036643465,769783313248,
 2781411265212,10049660711008,36312457046956]