235456

Appears in sequences

• Number of n-celled one-sided polyplets.at n=8A030233
• G.f.: A(x,y,z) = Sum_{n>=0} ((2n)!/n!^2)*[Sum_{k=0..2n} T(n,k)*z^k]*x^(2n)*y^n/(1-x-xy)^(4n+1) where A(x,y,x+xy) = Sum_{n>=0, k=0..n} C(n,k)^4*x^n*y^k at z = x+xy; this is the triangle of coefficients T(n,k), read by rows.at n=17A187056
• Number of (n+1)X(5+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=4A237012