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A146913 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation. 0
1, 1, 1, 3, 1, 5, 5, 13, 21, 65, 79, 331, 533, 2619, 5227, 28001, 61339, 390903, 1035837, 7813633, 23994329, 210020947, 748949341, 7662897803, 32193163805, 385464587673, 1890804496873, 26436803024815, 151320783550691 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.0

.0.1.1.1.0.1.1.1

.1.1.1.0.1.1.1.0

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.0.1.1.1.0.1.1.1

.1.1.1.0.1.1.1.0

.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A213952 A205873 A220479 * A146252 A181641 A049266

Adjacent sequences:  A146910 A146911 A146912 * A146914 A146915 A146916

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 9 04:05 EDT 2020. Contains 333343 sequences. (Running on oeis4.)