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A278683 as a simple table

na(n)
10
20
36
492
5832
64500
718229
858881
9163509
10401259
11898420
121861146
133625546
146694982
1511829267
1620099815
1733036079
1852700901
1981916834
20124362664
21184907220
22269726216
23386776561
24545930397
25759628777
261043027055
271414873104
281897655046
292518755934
303310591194

[0,0,6,92,832,4500,18229,58881,163509,401259,
 898420,1861146,3625546,6694982,11829267,20099815,
 33036079,52700901,81916834,124362664,184907220,
 269726216,386776561,545930397,759628777,
 1043027055,1414873104,1897655046,2518755934,
 3310591194]