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A010905 as a simple table

na(n)
04
115
256
3209
4780
52911
610864
740545
8151316
9564719
102107560
117865521
1229354524
13109552575
14408855776
151525870529
165694626340
1721252634831
1879315912984
19296011017105
201104728155436
214122901604639
2215386878263120
2357424611447841
24214311567528244

[4,15,56,209,780,2911,10864,40545,151316,564719,
 2107560,7865521,29354524,109552575,408855776,
 1525870529,5694626340,21252634831,79315912984,
 296011017105,1104728155436,4122901604639,
 15386878263120,57424611447841,214311567528244]