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A317891 as a simple table

na(n)
10
21
34
413
559
6252
71074
84633
919933
1085732
11368847
121586817
136826551
1429368380
15126345008
16543545426
172338372742
1810059853024
1943278232785
20186186164251
21800986675100
223445904026216
2314824534451888
2463776245668953

[0,1,4,13,59,252,1074,4633,19933,85732,368847,
 1586817,6826551,29368380,126345008,543545426,
 2338372742,10059853024,43278232785,186186164251,
 800986675100,3445904026216,14824534451888,
 63776245668953]