Triangular numbers (A000217) that are also centered pentagonal numbers (A005891).

A254628

Triangular numbers (A000217) that are also centered pentagonal numbers (A005891).

Terms

    a(0) =1a(1) =6a(2) =276a(3) =1891a(4) =88831a(5) =608856a(6) =28603266a(7) =196049701a(8) =9210162781a(9) =63127394826

External references