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A147232 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 27, 629, 1269, 16061, 41045, 855623, 2568747, 170862305, 635460019, 86331152665, 400700298989, 79692729384535, 451816155166949, 141187687229970535 (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

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

.0.0.1.0.0.1.0.0

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A146683 A146651 A146808 * A141417 A264834 A069529

Adjacent sequences: A147229 A147230 A147231 * A147233 A147234 A147235

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 4 19:22 EST 2023. Contains 360059 sequences. (Running on oeis4.)