A254255 Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally

12616, 72644, 268900, 718226, 2192422, 6729896, 21120938, 68298122, 216717474, 690324184, 2237606074, 7136863098, 23081712162, 74362141304, 239411652586, 774044161546, 2505136288034, 8097590302616, 26266047011098, 85077718931738

Offset

1,1

Comments

Column 3 of A254260

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 3*a(n-1) +6*a(n-2) -8*a(n-3) -7*a(n-4) +5*a(n-5) -102*a(n-6) -1232*a(n-7) +1096*a(n-8) +4880*a(n-9) +2464*a(n-10) -8128*a(n-11) -15360*a(n-12) +16384*a(n-13) for n>19

Example

Some solutions for n=2
..0..1..0..1..1....0..0..0..1..1....0..0..1..1..1....0..1..1..0..1
..1..1..0..1..1....1..0..0..1..1....0..0..0..0..0....1..1..1..1..0
..0..0..0..0..0....0..1..1..0..0....1..0..0..0..1....0..0..0..0..1
..1..1..1..1..1....1..1..0..0..1....0..1..1..1..1....1..1..1..1..0

Crossrefs

Sequence in context: A185841 A219332 A254262 * A254301 A237388 A185529

Adjacent sequences: A254252 A254253 A254254 * A254256 A254257 A254258

Keyword

nonn

Author

R. H. Hardin, Jan 27 2015

Status

approved