a(n) is the coefficient of x^(n^2) in expansion of ( (1 + x)/(1 - x) )^n.

A336522

a(n) is the coefficient of x^(n^2) in expansion of ( (1 + x)/(1 - x) )^n.

Terms

    a(0) =1a(1) =2a(2) =16a(3) =326a(4) =11008a(5) =525002a(6) =32497680a(7) =2478629134a(8) =224921989120

External references