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A222762 Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order 0
1, 3, 13, 465, 19766, 4479721, 1139211468, 1529339764557, 2262949907256195, 17477638597595547101, 147986778995780201368346, 6492535454463031607390365256 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A222769

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A066266 A092845 A216474 * A290376 A089711 A173759

Adjacent sequences:  A222759 A222760 A222761 * A222763 A222764 A222765

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 05 2013

STATUS

approved

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Last modified August 4 08:25 EDT 2020. Contains 336201 sequences. (Running on oeis4.)