Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253489
Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
Terms
- a(0) =414a(1) =1377a(2) =2640a(3) =4720a(4) =9654a(5) =22236a(6) =55362a(7) =145428a(8) =397002a(9) =1114476a(10) =3192402a(11) =9277188a(12) =27233562a(13) =80506716a(14) =239134242a(15) =712632948a(16) =2128361322a(17) =6366010956a(18) =19059888882a(19) =57103380708a(20) =171157572282a(21) =513167579196
External references
- oeis: A253489