A146918 - OEIS

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A146918

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1111-0110 pattern in any orientation.

1, 1, 1, 3, 3, 5, 11, 28, 126, 465, 2159, 10384, 61419, 350662, 3134292, 24610534, 338289380, 3522169071, 66083867346, 889383602362, 23393413306195, 406007037878536, 15318525889895482, 348828104686468855

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

Table of n, a(n) for n=1..24.

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

.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: A250396 A201866 A191632 * A093306 A093309 A187874

Adjacent sequences: A146915 A146916 A146917 * A146919 A146920 A146921

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved