Number of (3+1) X (n+1) 0..1 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

A250800

Number of (3+1) X (n+1) 0..1 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

Terms

    a(0) =58a(1) =180a(2) =482a(3) =1190a(4) =2776a(5) =6230a(6) =13598a(7) =29084a(8) =61274a(9) =127630a(10) =263544a(11) =540558a(12) =1102982a(13) =2241420a(14) =4540290a(15) =9173622a(16) =18497880a(17) =37239590a(18) =74873806a(19) =150386236a(20) =301805898a(21) =605284030a(22) =1213273912a(23) =2430926110a(24) =4868936566a(25) =9749335980

External references