Indices of centered square numbers (A001844) which are also heptagonal numbers (A000566).

A254229

Indices of centered square numbers (A001844) which are also heptagonal numbers (A000566).

Terms

    a(0) =1a(1) =46a(2) =207a(3) =14652a(4) =66493a(5) =4717738a(6) =21410379a(7) =1519096824a(8) =6894075385a(9) =489144459430

External references