a(n) = Sum_{k=0..n} binomial(n+k, k)^2.

A112029

a(n) = Sum_{k=0..n} binomial(n+k, k)^2.

Terms

    a(0) =1a(1) =5a(2) =46a(3) =517a(4) =6376a(5) =82994a(6) =1119210a(7) =15475205a(8) =217994860a(9) =3115374880a(10) =45035696036a(11) =657153097330

External references