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A147243 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 5, 11, 21, 39, 109, 383, 1291, 5187, 19147, 85163, 418695, 2523925, 15886439, 116954773, 866328129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.1.0.0.0

.1.0.1.1.1.0.0.0

.1.1.0.1.0.0.0.0

.0.1.1.0.0.0.1.1

.1.1.0.0.0.1.1.0

.0.0.0.0.1.0.1.1

.0.0.0.1.1.1.0.1

.0.0.0.1.0.1.1.0

CROSSREFS

Sequence in context: A293317 A230097 A146787 * A192664 A122997 A146042

Adjacent sequences:  A147240 A147241 A147242 * A147244 A147245 A147246

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 31 00:15 EDT 2020. Contains 338095 sequences. (Running on oeis4.)