A147234 - OEIS

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A147234

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.

1, 1, 1, 1, 3, 7, 19, 49, 195, 1111, 7177, 51609, 452845, 5123643, 72369101, 1214915609, 24818665423, 626087799933, 19508645488885, 741333829643879

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.0.0.0

.0.0.0.1.0.0.0.1

.1.0.0.1.1.0.1.1

.1.1.1.0.1.0.1.0

.1.0.1.1.0.1.1.1

.0.0.0.0.1.0.0.0

.0.0.1.1.1.0.0.0

.0.1.1.0.1.0.0.0

CROSSREFS

Sequence in context: A116903 A298416 A151266 * A171854 A182895 A087224

Adjacent sequences: A147231 A147232 A147233 * A147235 A147236 A147237

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved