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A223015 Number of 4Xn 0..1 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order 1
8, 34, 169, 840, 4685, 27159, 162547, 990115, 6118763, 38172647, 239969655, 1517064784, 9633861872, 61400164050, 392501061255, 2515493966790, 16156763152645, 103972548325169, 670214851495833, 4326757779281260 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A223012

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..45

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A227330 A252934 A229398 * A222796 A203445 A318244

Adjacent sequences:  A223012 A223013 A223014 * A223016 A223017 A223018

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 11 2013

STATUS

approved

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Last modified June 1 07:40 EDT 2020. Contains 334759 sequences. (Running on oeis4.)