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A147264 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 15, 33, 77, 553, 3895, 24243, 170053, 2059185, 30409467, 474043707, 8705603341, 222308455647, 7060172178631, 259928502701315 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.1.0

.0.0.0.0.1.1.1.0

.0.0.0.1.0.1.0.0

.0.0.0.1.1.0.0.0

.0.1.1.1.0.0.0.0

.0.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A212983 A055004 A332355 * A147150 A279231 A238340

Adjacent sequences:  A147261 A147262 A147263 * A147265 A147266 A147267

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 28 21:04 EDT 2022. Contains 354907 sequences. (Running on oeis4.)