Number of (7+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253441
Number of (7+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
Terms
- a(0) =613a(1) =612a(2) =625a(3) =660a(4) =732a(5) =876a(6) =1164a(7) =1740a(8) =2892a(9) =5196a(10) =9804a(11) =19020a(12) =37452a(13) =74316a(14) =148044a(15) =295500a(16) =590412a(17) =1180236a(18) =2359884a(19) =4719180a(20) =9437772a(21) =18874956a(22) =37749324a(23) =75498060a(24) =150995532a(25) =301990476a(26) =603980364a(27) =1207960140a(28) =2415919692a(29) =4831838796
External references
- oeis: A253441