Number of (3+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A253751
Number of (3+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
Terms
- a(0) =1998a(1) =16625a(2) =77414a(3) =247252a(4) =583698a(5) =1204422a(6) =2363797a(7) =4404701a(8) =7884084a(9) =14024725a(10) =25106259a(11) =45066424a(12) =81275585a(13) =147957366a(14) =271721790a(15) =502088605a(16) =932375372a(17) =1738806953a(18) =3252858270a(19) =6097945230a(20) =11448266368a(21) =21515673019a(22) =40464913904
External references
- oeis: A253751