Number of (n+1) X (4+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.
A253452
Number of (n+1) X (4+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.
Terms
- a(0) =3639a(1) =8554a(2) =11147a(3) =15730a(4) =26831a(5) =52912a(6) =114717a(7) =266911a(8) =656997a(9) =1694263a(10) =4540077a(11) =12545551a(12) =35498037a(13) =102227623a(14) =298160637a(15) =877448191a(16) =2598287877a(17) =7726760983a(18) =23044088397a(19) =68859886831a(20) =206034914517a(21) =617015262343
External references
- oeis: A253452