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A147256 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0001-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 549, 1079, 10673, 26871, 476485, 1364599, 88490477, 316329117, 38154154091, 169142706059, 28100677201207, 150981261883543, 38976852011544623 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A147132 A146840 A146587 * A147163 A147179 A146627

Adjacent sequences: A147253 A147254 A147255 * A147257 A147258 A147259

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 3 15:17 EST 2023. Contains 360035 sequences. (Running on oeis4.)