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A291915 as a simple table

na(n)
10
20
30
42
522
682
7268
8742
91902
104562
1110452
1223068
1349432
14103364
15211764
16426354
17845626
181655454
193203876
206137946
2111652946
2221944034
2341021256
2476174360
25140595760
26258061160
27471255240
28856536610
291550048766
302793774026
315016560956
328976350894

[0,0,0,2,22,82,268,742,1902,4562,10452,23068,
 49432,103364,211764,426354,845626,1655454,3203876,
 6137946,11652946,21944034,41021256,76174360,
 140595760,258061160,471255240,856536610,
 1550048766,2793774026,5016560956,8976350894]