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A146867 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 5, 9, 21, 33, 55, 141, 887, 2729, 13023, 38545, 182567, 834697, 7193987, 40372625, 350655929 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.1.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.0.0.1.1.1.1.0.0

.0.0.1.1.0.1.0.0

CROSSREFS

Sequence in context: A211427 A273410 A273486 * A068481 A146827 A297360

Adjacent sequences:  A146864 A146865 A146866 * A146868 A146869 A146870

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 9 10:56 EDT 2022. Contains 356021 sequences. (Running on oeis4.)