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A081659 as a simple table

na(n)
01
12
24
36
49
513
619
728
842
964
1099
11155
12245
13390
14624
151002
161613
172601
184199
196784
2010966
2117732
2228679
2346391
2475049
25121418
26196444
27317838
28514257
29832069
301346299
312178340
323524610
335702920
349227499
3514930387
3624157853
3739088206

[1,2,4,6,9,13,19,28,42,64,99,155,245,390,624,1002,
 1613,2601,4199,6784,10966,17732,28679,46391,75049,
 121418,196444,317838,514257,832069,1346299,
 2178340,3524610,5702920,9227499,14930387,24157853,
 39088206]