Nonnegative integers n such that n^2*(n+1)*(2*n+1)^2*(7*n+1)/36 is a square.

A007750

Nonnegative integers n such that n^2*(n+1)*(2*n+1)^2*(7*n+1)/36 is a square.

Terms

    a(0) =0a(1) =1a(2) =7a(3) =24a(4) =120a(5) =391a(6) =1921a(7) =6240a(8) =30624a(9) =99457a(10) =488071a(11) =1585080a(12) =7778520a(13) =25261831a(14) =123968257a(15) =402604224a(16) =1975713600a(17) =6416405761a(18) =31487449351a(19) =102259887960a(20) =501823476024

External references