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A015518 as a simple table

na(n)
00
11
22
37
420
561
6182
7547
81640
94921
1014762
1144287
12132860
13398581
141195742
153587227
1610761680
1732285041
1896855122
19290565367
20871696100
212615088301
227845264902
2323535794707
2470607384120
25211822152361
26635466457082

[0,1,2,7,20,61,182,547,1640,4921,14762,44287,
 132860,398581,1195742,3587227,10761680,32285041,
 96855122,290565367,871696100,2615088301,
 7845264902,23535794707,70607384120,211822152361,
 635466457082]