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A146392 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 3, 9, 23, 77, 415, 2809, 21039, 202829, 2557861, 41110329, 812468577, 20241517719, 638623731453, 25413793552471 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.1

.0.0.0.0.0.1.1.0

.1.0.0.0.0.0.1.1

.1.0.0.1.0.0.0.1

.1.1.0.1.1.0.0.1

.0.1.1.0.1.1.1.0

CROSSREFS

Sequence in context: A196488 A108488 A018334 * A116659 A147508 A146472

Adjacent sequences:  A146389 A146390 A146391 * A146393 A146394 A146395

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 18 20:28 EDT 2019. Contains 328197 sequences. (Running on oeis4.)