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A221887 as a simple table

na(n)
10
28
30
490
5204
61297
74608
823159
992312
10425249
111799292
127982268
1334469356
14151243634
15657198136
162872557590
1712512098304
1854609983231
19238067509008
201038559461306
214528789386340
2219753331212394
2386145964341528

[0,8,0,90,204,1297,4608,23159,92312,425249,
 1799292,7982268,34469356,151243634,657198136,
 2872557590,12512098304,54609983231,238067509008,
 1038559461306,4528789386340,19753331212394,
 86145964341528]