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A146801 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 169, 169, 2727, 2727, 71937, 71937, 1640171, 1640171, 45826977, 45826977 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.1.0.0.0.0.0.0.0.1

.1.0.1.0.0.0.1.0.1

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.1.0.1.0.0.0.1.0.1

.1.0.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A022351 A146873 A146793 * A147203 A146777 A147053

Adjacent sequences:  A146798 A146799 A146800 * A146802 A146803 A146804

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 19 21:28 EST 2022. Contains 350466 sequences. (Running on oeis4.)