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A027988 as a simple table

na(n)
01
11
22
34
47
514
626
751
897
9189
10365
11709
121383
132683
145270
1510220
1620175
1739130
1877533
19150438
20298925
21580328
221155661
232245004
244478413
258705686
2617390359
2733828704
2867650909
29131901368
30263589730
31515037942
321028483089

[1,1,2,4,7,14,26,51,97,189,365,709,1383,2683,5270,
 10220,20175,39130,77533,150438,298925,580328,
 1155661,2245004,4478413,8705686,17390359,33828704,
 67650909,131901368,263589730,515037942,1028483089]