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A202790 Number of nX3 binary arrays with every one adjacent to another one horizontally, diagonally, antidiagonally or vertically 1
4, 50, 398, 3018, 23436, 182430, 1417772, 11017196, 85621362, 665418194, 5171353118, 40189602848, 312336995590, 2427354106352, 18864392868124, 146606264807250, 1139363300400646, 8854660691296250, 68814763405175276 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A202795

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +2*a(n-2) +29*a(n-3) +16*a(n-4)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A240396 A197473 A219566 * A231833 A028455 A232731

Adjacent sequences:  A202787 A202788 A202789 * A202791 A202792 A202793

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 24 2011

STATUS

approved

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Last modified December 10 07:51 EST 2016. Contains 278994 sequences.