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A146856 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 27, 587, 1133, 10901, 28287, 585741, 1701229, 131274347, 487724577, 70353958073, 323657950757, 55264471537249, 310091943069627, 90510403672783457, 614791345688856355 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A147202 A146776 A147218 * A217409 A256361 A293927

Adjacent sequences:  A146853 A146854 A146855 * A146857 A146858 A146859

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 30 19:12 EDT 2022. Contains 354945 sequences. (Running on oeis4.)