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A253733 Number of (n+2)X(1+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal sum minus antidiagonal sum unequal to its neighbors horizontally and vertically 1
218, 720, 2212, 6932, 22236, 70372, 222820, 706884, 2242532, 7110804, 22555544, 71517456, 226861460, 719514384, 2281956628, 7237186788, 22954908172, 72802487404, 230901873532, 732329249252, 2322695885712, 7366657349992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A253740

LINKS

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

FORMULA

Empirical: a(n) = a(n-2) +15*a(n-3) +44*a(n-4) +26*a(n-5) +36*a(n-6) -241*a(n-7) -190*a(n-8) -589*a(n-9) -530*a(n-10) -920*a(n-11) -1248*a(n-12) -800*a(n-13) -384*a(n-14) for n>15

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A045239 A185462 A253740 * A241102 A292545 A321115

Adjacent sequences:  A253730 A253731 A253732 * A253734 A253735 A253736

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 11 2015

STATUS

approved

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Last modified September 22 09:47 EDT 2021. Contains 347606 sequences. (Running on oeis4.)