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A226991 as a simple table

na(n)
128
2729
311325
4180712
52601925
633118416
7369163839
83630637294
931856129416
10252318062428
111823504154187
1212137736643546
1375012367805101
14433388500017180
152354668881960077
1612091925893979800
1758950535990057164

[28,729,11325,180712,2601925,33118416,369163839,
 3630637294,31856129416,252318062428,1823504154187,
 12137736643546,75012367805101,433388500017180,
 2354668881960077,12091925893979800,
 58950535990057164]