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A026576 as a simple table

na(n)
21
33
418
565
6346
71288
86818
925518
10136152
11510532
122745347
1310309234
1455784794
15209766714
161140670242
174294635438
1823445204441

[1,3,18,65,346,1288,6818,25518,136152,510532,
 2745347,10309234,55784794,209766714,1140670242,
 4294635438,23445204441]