Number of (n+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

A250722

Number of (n+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Terms

    a(0) =9a(1) =46a(2) =208a(3) =885a(4) =3605a(5) =14437a(6) =57397a(7) =228455a(8) =912438a(9) =3661515a(10) =14755226a(11) =59674645a(12) =241996099a(13) =983339540a(14) =4001469252a(15) =16299591564a(16) =66441841973a(17) =270971703338

External references