Number of (n+2)X(3+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.
A254563
Number of (n+2)X(3+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) =10240a(1) =54212a(2) =312322a(3) =978154a(4) =2647806a(5) =7796356a(6) =20277514a(7) =50757141a(8) =124775368a(9) =293581128a(10) =660747412a(11) =1455827541a(12) =3098474026a(13) =6387841207a(14) =12869403490a(15) =25261405390a(16) =48376904916a(17) =90820987001a(18) =167055923784a(19) =301392610641
External references
- oeis: A254563