Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the four sums of the central row, central column, diagonal and antidiagonal nondecreasing horizontally and vertically.
A254567
Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the four sums of the central row, central column, diagonal and antidiagonal nondecreasing horizontally and vertically.
Terms
- a(0) =1029664a(1) =4205934a(2) =20277514a(3) =25618602a(4) =45085796a(5) =120967261a(6) =206491388a(7) =496247824a(8) =980309768a(9) =2140733638a(10) =4396657758a(11) =9138690014a(12) =18508554954a(13) =37124963771a(14) =73186116528a(15) =142299121992a(16) =272494928124a(17) =514557580661
External references
- oeis: A254567