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A146689 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 5, 13, 49, 193, 1049, 4657, 30659, 227143, 2543595, 27086837, 477421833, 7701671605 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.1.0.0.0.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.0.0.0.1.1.1.1

.1.1.1.1.0.0.0.0

.1.0.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.0.0.0.1.1.1.1

CROSSREFS

Sequence in context: A149535 A149536 A149537 * A146657 A243304 A238508

Adjacent sequences: A146686 A146687 A146688 * A146690 A146691 A146692

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified December 6 21:00 EST 2022. Contains 358648 sequences. (Running on oeis4.)