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A190312 as a simple table

na(n)
10
20
340
4368
51704
65704
715400
836096
975632
10145968
11263592
12451392
13738360
141163552
151774840
162632344
173808992
185394752
197493936
2010233832
2113759008
2218241312
2323877984
2430896984
2539551456
2650137240
2762983128
2878459880

[0,0,40,368,1704,5704,15400,36096,75632,145968,
 263592,451392,738360,1163552,1774840,2632344,
 3808992,5394752,7493936,10233832,13759008,
 18241312,23877984,30896984,39551456,50137240,
 62983128,78459880]