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.

A250652

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) =34a(2) =109a(3) =316a(4) =859a(5) =2234a(6) =5625a(7) =13816a(8) =33271a(9) =78838a(10) =184309a(11) =425972a(12) =974835a(13) =2211826a(14) =4980721a(15) =11141104a(16) =24772591a(17) =54788078a(18) =120586221a(19) =264241132a(20) =576716779a(21) =1254096874a(22) =2717908969a(23) =5872025576a(24) =12650020839a(25) =27179089894

External references