3542000domain: NAppears in sequencesa(n) = (n+1)*binomial(n+6,6).at n=19A027818a(n) = C(n+3,3)*n^3/4.at n=20A085284a(n) = binomial(n+3,3)*binomial(n+6,3).at n=19A105939Number of (n+1)X(6+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=20A237635