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A259265 as a simple table

na(n)
15
25
331
4346201
5209102521
66813584502670671709484968734757499815278649237224386797415881735111285309440001

[5,5,31,346201,209102521,
 68135845026706717094849687347574998152786492372243\
 86797415881735111285309440001]