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A002639 as a simple table

na(n)
00
11
21
321
431
56257
610293
7279025
8483127
9435506703
10776957575
1122417045555
1240784671953
139569130097211
1417652604545791
15523910972020563
16976501268709949
17935823746406530603
181758220447807291611

[0,1,1,21,31,6257,10293,279025,483127,435506703,
 776957575,22417045555,40784671953,9569130097211,
 17652604545791,523910972020563,976501268709949,
 935823746406530603,1758220447807291611]