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A146923 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 6, 12, 19, 29, 56, 159, 456, 1350, 3940, 11848, 42451, 167584, 713562, 3187201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.1.0.1.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.1.0.1.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A078816 A051936 A215342 * A256977 A087883 A218438

Adjacent sequences:  A146920 A146921 A146922 * A146924 A146925 A146926

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 15 07:38 EDT 2019. Contains 328026 sequences. (Running on oeis4.)