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A047761 as a simple table

na(n)
00
11
21
33
45
512
623
755
8114
9273
10588
111428
123156
137752
1417427
1543263
1698516
17246675
18567281
191430715
203316521
218414640
2219633796
2350067108
24117464424
25300830572
26709098696
271822766520
284313876888
2911124755664
3026421284043

[0,1,1,3,5,12,23,55,114,273,588,1428,3156,7752,
 17427,43263,98516,246675,567281,1430715,3316521,
 8414640,19633796,50067108,117464424,300830572,
 709098696,1822766520,4313876888,11124755664,
 26421284043]