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A147278 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 13, 29, 79, 475, 3011, 19375, 140949, 1504567, 19831039, 315319119, 5871550053, 136334165017, 3923421131189, 139268183686163 (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

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.1.0

.0.0.0.0.0.1.1.0

.0.0.0.0.1.1.0.0

.0.0.0.1.0.0.0.0

.0.0.1.1.0.0.0.0

.1.1.1.0.0.0.0.0

.1.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A239367 A124698 A337761 * A268963 A147349 A147288

Adjacent sequences:  A147275 A147276 A147277 * A147279 A147280 A147281

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified December 4 13:29 EST 2021. Contains 349526 sequences. (Running on oeis4.)