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A146905 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 13, 21, 41, 107, 243, 717, 1683, 4947, 13775, 49539, 165935, 690319, 2538097, 11779735, 49469745, 268313075, 1318481817, 8182984957 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.0.0.0

.0.0.0.0.1.1.1.0.0.0

.0.1.0.0.1.0.0.1.0.0

.0.1.1.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.1.1.0

.0.0.1.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0.0.0

.0.0.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A187212 A141325 A248604 * A052282 A001993 A284829

Adjacent sequences:  A146902 A146903 A146904 * A146906 A146907 A146908

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 25 19:39 EST 2021. Contains 341618 sequences. (Running on oeis4.)