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A251503 as a simple table

na(n)
1670690
2464687066
3321542579960
4222571918258598
5154063583681248806
6106642617845371027692
773817882968740867259470
851096644852447901613635406
935369032672430117642615385524

[670690,464687066,321542579960,222571918258598,
 154063583681248806,106642617845371027692,
 73817882968740867259470,
 51096644852447901613635406,
 35369032672430117642615385524]