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A320937 as a simple table

na(n)
10
20
31
44
520
686
7409
81988
910404
1057488
11338180
122103378
1313814202
1495423766
15691415451
165239857008
1741431883216
18341036489096
192916365967707
2025862060748614
21237434856965694
222253357681164288
2322076002386446896
24222979432604192844
252319295160051570620

[0,0,1,4,20,86,409,1988,10404,57488,338180,
 2103378,13814202,95423766,691415451,5239857008,
 41431883216,341036489096,2916365967707,
 25862060748614,237434856965694,2253357681164288,
 22076002386446896,222979432604192844,
 2319295160051570620]