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A146409 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 73, 235, 975, 4059, 17677, 73575, 388495, 2342809, 17238179, 130497747, 1139591877, 10255691217, 112977046301 (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

.0.0.0.0.0.1.0.0

.0.0.1.1.1.1.0.0

.0.1.0.0.1.0.1.1

.0.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.0

.1.1.0.1.0.0.1.0

.0.0.1.1.1.1.0.0

.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A146734 A146614 A146670 * A147111 A146401 A146465

Adjacent sequences:  A146406 A146407 A146408 * A146410 A146411 A146412

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified January 22 18:12 EST 2022. Contains 350484 sequences. (Running on oeis4.)