330876domain: NAppears in sequencesCoefficient of q^1 in nu(n), where nu(0)=1, nu(1)=b and, for n>=2, nu(n)=b*nu(n-1)+lambda*(1+q+q^2+...+q^(n-2))*nu(n-2) with (b,lambda)=(1,3).at n=14A074355a(n) = n*(n + 1)*(n + 2)*(4*n - 3)/6.at n=26A264851