Number of (n+2)X(2+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.
A254562
Number of (n+2)X(2+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) =2384a(1) =10870a(2) =54212a(3) =183210a(4) =536906a(5) =1612832a(6) =4205934a(7) =10525070a(8) =25843648a(9) =60108505a(10) =134388526a(11) =293848960a(12) =621358505a(13) =1276346055a(14) =2565832463a(15) =5035276195a(16) =9660711323a(17) =18188928868a(18) =33596838971a(19) =60932752216a(20) =108732023416
External references
- oeis: A254562