Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.
A253450
Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.
Terms
- a(0) =414a(1) =1975a(2) =4782a(3) =8554a(4) =15220a(5) =31630a(6) =74324a(7) =188438a(8) =502364a(9) =1387310a(10) =3928484a(11) =11324678a(12) =33058604a(13) =97351070a(14) =288409844a(15) =857948918a(16) =2559291644a(17) =7648770830a(18) =22888110404a(19) =68547933158a(20) =205411009484a(21) =615767454590
External references
- oeis: A253450