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A146802 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 47, 187, 1039, 7375, 57703, 534255, 6065861, 87670715, 1568278041, 34768369321, 953623406901, 31496022601955, 1268361436313019, 63421807483845045 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

.0.1.0.1.1.0.0.1

.1.1.1.0.0.1.0.1

.1.0.1.0.0.1.1.1

.1.0.0.1.1.0.1.0

.0.0.0.0.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A287431 A127736 A212677 * A147054 A146629 A195965

Adjacent sequences:  A146799 A146800 A146801 * A146803 A146804 A146805

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 19 21:26 EST 2022. Contains 350466 sequences. (Running on oeis4.)