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A146433 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 13, 25, 49, 124, 263, 846, 2209, 7594, 21663, 81736, 275021, 1243671, 4831201, 26082779, 118314435, 731456697, 3805948133, 26532655113, 159482402665 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A133033 A145365 A306833 * A134672 A321024 A211389

Adjacent sequences:  A146430 A146431 A146432 * A146434 A146435 A146436

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 18 10:18 EST 2019. Contains 329261 sequences. (Running on oeis4.)