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A254476 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal minimum nondecreasing horizontally and vertically 2
512, 2696, 12260, 47140, 170504, 586508, 1964388, 6462708, 21003228, 67662328, 216533720, 689480684, 2187191068, 6918332408, 21836278536, 68808353156, 216551437648, 680873827704, 2139217784216, 6717384585616, 21084279168188 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A254483

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -8*a(n-2) -9*a(n-3) +19*a(n-4) +4*a(n-5) -22*a(n-6) +23*a(n-7) +5*a(n-8) -162*a(n-9) +276*a(n-10) -83*a(n-11) -50*a(n-12) +218*a(n-13) -326*a(n-14) +66*a(n-15) +9*a(n-16) -60*a(n-17) +78*a(n-18) +5*a(n-19) +23*a(n-20) -6*a(n-21) +4*a(n-22) -a(n-23) -5*a(n-24) -2*a(n-26) -a(n-27) for n>32

EXAMPLE

Some solutions for n=4

..0..0..1....0..0..1....1..1..0....0..0..1....0..1..1....0..0..1....1..0..1

..1..1..0....0..0..1....0..0..0....0..1..1....1..0..0....0..0..1....0..1..0

..0..1..0....1..0..1....1..1..1....1..1..0....1..1..1....0..1..0....1..1..0

..1..1..0....1..0..1....1..1..1....1..1..0....1..0..0....1..0..1....1..1..0

..1..1..1....1..1..1....1..0..1....0..0..0....0..0..1....1..1..1....0..1..1

..0..1..1....1..1..1....0..1..1....1..1..1....1..1..1....1..1..1....1..0..1

CROSSREFS

Sequence in context: A186832 A254553 A254483 * A254804 A253820 A253813

Adjacent sequences:  A254473 A254474 A254475 * A254477 A254478 A254479

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2015

STATUS

approved

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Last modified October 4 09:28 EDT 2022. Contains 357239 sequences. (Running on oeis4.)