13571712domain: NAppears in sequencesa(n) = (n+1)*binomial(n+1,5).at n=31A027765a(n) = Sum_{i=1..n-1} (-1)^i*binomial(n, i-1)*binomial(n, i)*binomial(n, i+1).at n=11A158194Number T(n,m) of ways of 4-coloring an n X m grid so that there is no rectangle with all 4 corners the same color.at n=16A200045