Octagonal numbers (A000567) that are also centered heptagonal numbers (A069099).

A254857

Octagonal numbers (A000567) that are also centered heptagonal numbers (A069099).

Terms

    a(0) =1a(1) =8a(2) =736a(3) =5461a(4) =496133a(5) =3680776a(6) =334392976a(7) =2480837633a(8) =225380369761

External references