Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A254505
Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
Terms
- a(0) =512a(1) =2703a(2) =12730a(3) =55904a(4) =221858a(5) =833037a(6) =2977462a(7) =10225464a(8) =34028886a(9) =110280168a(10) =349551666a(11) =1087417895a(12) =3328908758a(13) =10051170955a(14) =29985882752a(15) =88525404974a(16) =258951023734a(17) =751340000125
External references
- oeis: A254505