a(n) is the sum of the squares of the coefficients of (x + 2*y + 3*z)^n.

A186376

a(n) is the sum of the squares of the coefficients of (x + 2*y + 3*z)^n.

Terms

    a(0) =1a(1) =14a(2) =294a(3) =7292a(4) =198310a(5) =5717124a(6) =171485916a(7) =5290989816a(8) =166688596998

External references