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A006491 as a simple table

na(n)
11
20
34
45
515
628
760
8117
9230
10440
11834
121560
132891
145310
159680
1617527
1731545
1856468
19100590
20178395
21315106
22554530
23972564
241700400
252964325
265153868
278938300
2815465497
2926700915
3046004620
3179112304
32135801105
33232715006
34398151740

[1,0,4,5,15,28,60,117,230,440,834,1560,2891,5310,
 9680,17527,31545,56468,100590,178395,315106,
 554530,972564,1700400,2964325,5153868,8938300,
 15465497,26700915,46004620,79112304,135801105,
 232715006,398151740]