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A261062 as a simple table

na(n)
10
20
31
40
56
68
730
8121
9385
101102
114207
1213263
1348904
14164298
15610450
162108897
177592564
1827444148
19100851443
20365507140
211344593522
224960584613
2318435632285
2468320148701
25254166868115
26951593812462
273568369245595
2813386056545363
2950416752718382

[0,0,1,0,6,8,30,121,385,1102,4207,13263,48904,
 164298,610450,2108897,7592564,27444148,100851443,
 365507140,1344593522,4960584613,18435632285,
 68320148701,254166868115,951593812462,
 3568369245595,13386056545363,50416752718382]