Number of (n+1) X (4+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.
A250751
Number of (n+1) X (4+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.
Terms
- a(0) =203a(1) =663a(2) =2123a(3) =6663a(4) =20603a(5) =63063a(6) =191723a(7) =580263a(8) =1751003a(9) =5273463a(10) =15861323a(11) =47665863a(12) =143161403a(13) =429811863a(14) =1290090923a(15) =3871583463a(16) =11617371803a(17) =34857358263a(18) =104582560523a(19) =313768653063a(20) =941347902203
External references
- oeis: A250751