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A228687 Number of 6Xn binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally. 1
64, 239, 5215, 32928, 475809, 3837761, 46125216, 419022831, 4618533791, 44467300608, 470238325217, 4657579001857, 48279924803328, 484835649414511, 4977465842992607, 50320320341072096, 514193976056767137 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A228683

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +88*a(n-2) -138*a(n-3) -1388*a(n-4) +1332*a(n-5) +5911*a(n-6) -2920*a(n-7) -8340*a(n-8) +816*a(n-9) +2232*a(n-10)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A222547 A218524 A188863 * A349109 A223332 A340696

Adjacent sequences:  A228684 A228685 A228686 * A228688 A228689 A228690

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 30 2013

STATUS

approved

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Last modified January 21 03:58 EST 2022. Contains 350473 sequences. (Running on oeis4.)