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A264295 as a simple table

na(n)
15
28
389
4192
51413
64352
724781
890112
9449665
101781256
118340733
1234594368
13156594265
14665254400
152958805225
1612729812160
1756099851853
18242965239816
191065598885233
204631110326400
2120260075655037
2288211124098304

[5,8,89,192,1413,4352,24781,90112,449665,1781256,
 8340733,34594368,156594265,665254400,2958805225,
 12729812160,56099851853,242965239816,
 1065598885233,4631110326400,20260075655037,
 88211124098304]