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A208692 Number of 6 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 0 1 vertically. 1
21, 441, 1113, 11067, 41013, 301035, 1346961, 8556723, 42184905, 249260739, 1292345649, 7358809899, 39164938617, 218805732243, 1180444035057, 6530395532955, 35479909625769, 195286010577987, 1064871399311265 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A208688.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) + 26*a(n-2) + 6*a(n-3) - 78*a(n-4).

Empirical g.f.: 21*x*(1 + 20*x + 6*x^2 - 78*x^3) / (1 - x - 26*x^2 - 6*x^3 + 78*x^4). - Colin Barker, Jul 05 2018

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

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

CROSSREFS

Cf. A208688.

Sequence in context: A207273 A207766 A207733 * A207562 A207417 A207389

Adjacent sequences:  A208689 A208690 A208691 * A208693 A208694 A208695

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 01 2012

STATUS

approved

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Last modified November 29 09:10 EST 2021. Contains 349416 sequences. (Running on oeis4.)