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A147047 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 5, 9, 25, 73, 125, 433, 1109, 4789, 15605, 79281, 298381, 1737861, 8105277, 59580321, 339696501, 2994804821, 20458651317, 215020666113, 1796632825373, 23034291528869, 233369066240557, 3603324644623713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.0.0

.0.0.0.1.1.0.0.0

.0.0.1.0.1.1.1.0

.0.1.1.1.0.1.0.0

.0.0.0.1.1.0.0.0

.0.0.0.1.0.0.0.0

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A324792 A147197 A323301 * A173322 A097910 A321655

Adjacent sequences:  A147044 A147045 A147046 * A147048 A147049 A147050

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified December 5 22:37 EST 2019. Contains 329782 sequences. (Running on oeis4.)