Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum or central row sum equal to the central column sum.
A258540
Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum or central row sum equal to the central column sum.
Terms
- a(0) =2520a(1) =8836a(2) =20736a(3) =57600a(4) =142544a(5) =381924a(6) =956736a(7) =2496400a(8) =6344576a(9) =16467364a(10) =42350672a(11) =110082064a(12) =285367424a(13) =743652900a(14) =1936887872a(15) =5057485456a(16) =13206499776a(17) =34526842596a(18) =90279314432a(19) =236188224064a(20) =617983034784
External references
- oeis: A258540