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A147054 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1101-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 47, 193, 927, 6473, 56977, 532817, 5726035, 80429995, 1421425107, 32032166721, 887240799013, 28935423830217, 1147385224061533, 56743981461830039 (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

.0.0.1.1.1.0.0.0

.0.0.1.0.1.1.0.0

.1.1.0.0.1.0.1.0

.1.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.1

.0.1.0.1.0.0.1.1

.0.0.1.1.0.1.0.0

.0.0.0.1.1.1.0.0

CROSSREFS

Sequence in context: A127736 A212677 A146802 * A146629 A195965 A137182

Adjacent sequences:  A147051 A147052 A147053 * A147055 A147056 A147057

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 2 16:36 EDT 2022. Contains 355029 sequences. (Running on oeis4.)