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A262391 as a simple table

na(n)
10
20
30
41
52
66
734
8257
92606
10440564
116384634
1296262938
131496225352
1423833988129
15387591510244
166415851530241
17107854282197058

[0,0,0,1,2,6,34,257,2606,440564,6384634,96262938,
 1496225352,23833988129,387591510244,6415851530241,
 107854282197058]