Number of (3+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253497
Number of (3+1) X (n+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) =1388a(1) =2640a(2) =4196a(3) =6476a(4) =11937a(5) =25715a(6) =60586a(7) =151946a(8) =399466a(9) =1088906a(10) =3050986a(11) =8724746a(12) =25321066a(13) =74260106a(14) =219377386a(15) =651329546a(16) =1940386666a(17) =5793959306a(18) =17327479786a(19) =51873646346a(20) =155403356266a(21) =465774906506
External references
- oeis: A253497