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A281768 Number of 4Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
0, 20, 90, 560, 2808, 13968, 68362, 323280, 1529974, 7114300, 32915192, 151142772, 689726508, 3133687480, 14169310798, 63838844556, 286639424578, 1283124275056, 5728711606322, 25513799290264, 113382456085042, 502859346935932 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 4 of A281765.
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0. .0..1..0..1. .0..0..1..1. .0..0..0..0. .0..0..1..0
..0..1..1..1. .0..0..1..0. .0..1..0..1. .1..1..0..0. .0..1..1..1
..1..1..1..1. .0..0..0..1. .0..0..1..0. .1..1..0..0. .0..0..1..1
..1..1..1..1. .0..0..1..1. .0..0..0..1. .1..1..0..0. .0..0..0..1
CROSSREFS
Cf. A281765.
Sequence in context: A338485 A344334 A225882 * A225892 A366933 A211140
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2017
STATUS
approved

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Last modified June 22 09:08 EDT 2024. Contains 373568 sequences. (Running on oeis4.)