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A006749 as a simple table

na(n)
10
20
30
41
55
620
784
8316
91196
104461
1116750
1262878
13237394
14899265
153422111
1613069026
1750091095
18192583152
19742560511
202870523142
2111122817672
2243191285751
23168046076423
24654997492842
252557223459805
269999080270766
2739152997087077
28153511067364760

[0,0,0,1,5,20,84,316,1196,4461,16750,62878,237394,
 899265,3422111,13069026,50091095,192583152,
 742560511,2870523142,11122817672,43191285751,
 168046076423,654997492842,2557223459805,
 9999080270766,39152997087077,153511067364760]