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A278639 as a simple table

na(n)
00
10
20
31
43
512
638
7117
8336
9976
102724
117689
1221455
1360228
14168714
15475037
161338861
173788400
1810742588
1930556305
2087112059
21248967564
22713032782
232046325125
245883428618
2516944975048
2648880471500
27141212377489
28408509453511
291183275193908
303431504760514

[0,0,0,1,3,12,38,117,336,976,2724,7689,21455,
 60228,168714,475037,1338861,3788400,10742588,
 30556305,87112059,248967564,713032782,2046325125,
 5883428618,16944975048,48880471500,141212377489,
 408509453511,1183275193908,3431504760514]