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A254253 Number of (n+2)X(1+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 2
512, 2812, 12616, 54236, 236024, 1021428, 4351908, 18369164, 77344420, 325241108, 1364914276, 5718111752, 23932201612, 100109932552, 418582178324, 1749544313608, 7310677021040, 30543411626736, 127592728853128 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A254260
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) -13*a(n-2) +11*a(n-3) -13*a(n-4) -60*a(n-5) -32*a(n-6) +210*a(n-7) +501*a(n-8) -221*a(n-9) +109*a(n-10) -981*a(n-11) -1875*a(n-12) +1430*a(n-13) +856*a(n-14) -180*a(n-15) +468*a(n-16) -216*a(n-17)
EXAMPLE
Some solutions for n=4
..0..1..0....0..0..1....0..0..0....0..1..1....1..1..1....1..1..1....0..1..0
..1..0..0....1..1..0....1..0..0....1..1..0....0..1..0....1..1..1....0..0..0
..0..1..1....1..0..1....0..1..1....1..1..0....1..1..1....1..1..1....0..1..1
..0..1..1....1..1..0....0..0..0....1..0..1....1..0..1....0..0..1....0..0..0
..0..0..0....0..0..0....0..1..1....1..1..0....0..1..1....0..1..1....0..1..1
..0..1..1....1..1..1....0..1..1....0..1..1....0..1..0....0..1..1....1..0..1
CROSSREFS
Sequence in context: A254306 A258530 A254922 * A254915 A257154 A254743
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2015
STATUS
approved

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Last modified April 14 20:39 EDT 2024. Contains 371667 sequences. (Running on oeis4.)