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A051656 as a simple table

na(n)
00
11
23
312
421
577
6168
7609
8987
93572
107755
1128059
1247376
13171409
14372099
151346268
162178309
177881197
1817108664
1961899729
20104512485
21378129724
22820851717
232969869413
244809706272
2517401680769
2637775923491
27136674575148

[0,1,3,12,21,77,168,609,987,3572,7755,28059,47376,
 171409,372099,1346268,2178309,7881197,17108664,
 61899729,104512485,378129724,820851717,2969869413,
 4809706272,17401680769,37775923491,136674575148]