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A027455 as a simple table

na(n)
215
365
4175
59963
65368
71105000
85720625
9105686875
1075492928
1174269960128
1256445795000
1396454009575000
1476498373160000
1561692439558464
16403805999193597
171643804692663258125
181377243480733120000

[15,65,175,9963,5368,1105000,5720625,105686875,
 75492928,74269960128,56445795000,96454009575000,
 76498373160000,61692439558464,403805999193597,
 1643804692663258125,1377243480733120000]