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A287899 as a simple table

na(n)
01
11
25
331
4217
51661
613721
7121703
81157857
911826121
10129877645
111535504015
1219546846441
13267633414517
143932330905361
1561806788736551
161035452546213441
1718421374554192017
18346790652640704725
196885640002624595007
20143771244649798115257

[1,1,5,31,217,1661,13721,121703,1157857,11826121,
 129877645,1535504015,19546846441,267633414517,
 3932330905361,61806788736551,1035452546213441,
 18421374554192017,346790652640704725,
 6885640002624595007,143771244649798115257]