A147047 - OEIS

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.

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

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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