A254580 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and the central column and the two maximums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally

2868, 17125, 110259, 649029, 3699505, 20636376, 113625185, 620711336, 3373135090, 18264736875, 98647342190, 531808220933, 2863102898609, 15398762726636, 82758818007939, 444534030091734, 2386816917665844

Offset

1,1

Comments

Column 2 of A254586

Links

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

Formula

Empirical: a(n) = 12*a(n-1) -48*a(n-2) +79*a(n-3) -92*a(n-4) +142*a(n-5) +32*a(n-6) -478*a(n-7) +621*a(n-8) -532*a(n-9) +163*a(n-10) +663*a(n-11) -1420*a(n-12) +897*a(n-13) +747*a(n-14) -1090*a(n-15) +563*a(n-16) +93*a(n-17) -976*a(n-18) +633*a(n-19) +361*a(n-20) -596*a(n-21) +82*a(n-22) +193*a(n-23) -32*a(n-24) -16*a(n-25) for n>30

Example

Some solutions for n=3
..0..0..0..0....1..0..1..1....1..0..0..0....0..0..0..0....0..0..1..0
..1..0..0..1....0..0..0..1....0..0..0..0....0..0..1..1....0..0..1..0
..0..0..0..0....0..1..1..1....1..1..1..1....0..1..0..1....0..1..1..0
..0..0..1..0....0..1..1..0....0..1..1..1....0..1..0..1....1..1..1..1
..0..0..1..1....1..1..1..1....1..0..0..0....0..1..1..1....0..0..1..0

Crossrefs

Sequence in context: A235571 A327376 A254587 * A254355 A261859 A286526

Adjacent sequences: A254577 A254578 A254579 * A254581 A254582 A254583

Keyword

nonn

Author

R. H. Hardin, Feb 01 2015

Status

approved