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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A108521 as a simple table

na(n)
11
22
35
416
553
6194
7730
82868
911526
1047370
11197786
12837467
133585696
1415501423
1567563442
16296579626
171309973823
185817855174
1925964218471
20116379947718
21523699384013
222364967753113
2310714396241046
2448684193997623

[1,2,5,16,53,194,730,2868,11526,47370,197786,
 837467,3585696,15501423,67563442,296579626,
 1309973823,5817855174,25964218471,116379947718,
 523699384013,2364967753113,10714396241046,
 48684193997623]