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A015521 as a simple table

na(n)
00
11
23
313
451
5205
6819
73277
813107
952429
10209715
11838861
123355443
1313421773
1453687091
15214748365
16858993459
173435973837
1813743895347
1954975581389
20219902325555
21879609302221
223518437208883
2314073748835533

[0,1,3,13,51,205,819,3277,13107,52429,209715,
 838861,3355443,13421773,53687091,214748365,
 858993459,3435973837,13743895347,54975581389,
 219902325555,879609302221,3518437208883,
 14073748835533]