Pentagonal numbers (A000326) which are also centered square numbers (A001844).

A254711

Pentagonal numbers (A000326) which are also centered square numbers (A001844).

Terms

    a(0) =1a(1) =5a(2) =145a(3) =925a(4) =28085a(5) =179401a(6) =5448301a(7) =34802825a(8) =1056942265a(9) =6751568605a(10) =205041351065

External references