Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253430
Number of (n+1) X (3+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) =69a(1) =70a(2) =85a(3) =121a(4) =193a(5) =337a(6) =625a(7) =1201a(8) =2353a(9) =4657a(10) =9265a(11) =18481a(12) =36913a(13) =73777a(14) =147505a(15) =294961a(16) =589873a(17) =1179697a(18) =2359345a(19) =4718641a(20) =9437233a(21) =18874417a(22) =37748785a(23) =75497521a(24) =150994993a(25) =301989937a(26) =603979825a(27) =1207959601a(28) =2415919153a(29) =4831838257
External references
- oeis: A253430