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A147471 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 3, 9, 15, 33, 57, 163, 337, 1301, 3059, 12941, 34215, 171133, 573633, 3343793, 12826849, 85459189, 371588907, 2938061259, 15238544087, 143663828309 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.1

.1.1.1.1.0.0.1.0

.0.0.1.1.0.0.1.0

.0.1.0.0.1.1.0.0

.0.1.0.0.1.1.1.1

.1.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A223209 A233026 A105423 * A062510 A000200 A100744

Adjacent sequences:  A147468 A147469 A147470 * A147472 A147473 A147474

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 13 17:35 EDT 2021. Contains 343863 sequences. (Running on oeis4.)