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A145967 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a one by five or five by one block. 0
1, 1, 1, 1, 1, 3, 8, 27, 89, 333, 1310, 7293, 48975, 401989, 3756663, 40465266, 497724568, 7379658407, 131602632698, 2820564955461, 71452077409468, 2129247440397929, 74391175132817461, 3073387865714226226 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.1.1.1.1.1.0

.0.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.0.0.1.1.1.1.1.0

CROSSREFS

Sequence in context: A210680 A121650 A151462 * A145792 A148834 A148835

Adjacent sequences:  A145964 A145965 A145966 * A145968 A145969 A145970

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2008

STATUS

approved

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Last modified September 16 10:23 EDT 2019. Contains 327094 sequences. (Running on oeis4.)