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A146662 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 41, 133, 407, 1175, 4535, 22999, 120797, 662265, 4237243, 30856447, 236921167, 2042840001, 20458483743, 233380921399 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.0.0.0.1.1.1.0.1

.0.0.0.1.0.0.1.1

.0.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.0

.1.1.0.0.1.0.0.0

.1.0.1.1.1.0.0.0

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A241626 A160704 A279673 * A145947 A153084 A285927

Adjacent sequences:  A146659 A146660 A146661 * A146663 A146664 A146665

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 30 17:36 EDT 2022. Contains 354943 sequences. (Running on oeis4.)