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A247587 as a simple table

na(n)
10
20
31
42
54
68
713
820
930
1042
1157
1274
1395
14120
15149
16182
17219
18261
19309
20362
21420
22485
23556
24632
25715
26806
27906
281012
291125
301247
311377
321517
331666
341824
351993
362170
372358
382555
392765
402986

[0,0,1,2,4,8,13,20,30,42,57,74,95,120,149,182,219,
 261,309,362,420,485,556,632,715,806,906,1012,1125,
 1247,1377,1517,1666,1824,1993,2170,2358,2555,2765,
 2986]