Number of (2+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.
A253436
Number of (2+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) =39a(1) =58a(2) =70a(3) =102a(4) =174a(5) =318a(6) =606a(7) =1182a(8) =2334a(9) =4638a(10) =9246a(11) =18462a(12) =36894a(13) =73758a(14) =147486a(15) =294942a(16) =589854a(17) =1179678a(18) =2359326a(19) =4718622a(20) =9437214a(21) =18874398a(22) =37748766a(23) =75497502a(24) =150994974a(25) =301989918a(26) =603979806a(27) =1207959582a(28) =2415919134a(29) =4831838238
External references
- oeis: A253436