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A146997 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 6, 1, 15, 1, 79, 13, 545, 41, 5277, 308, 66438, 2695, 1162610, 29727, 27605281, 454197, 898228670, 10169685, 40179297824, 297550563 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.1.1.1.1.0.0

.1.0.0.0.1.0.0.0.1

.1.0.0.0.1.0.0.0.1

.1.1.1.0.0.0.1.1.1

.1.0.0.0.1.0.0.0.1

.1.0.0.0.1.0.0.0.1

.0.0.1.1.1.1.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A176121 A062190 A080211 * A147483 A050309 A103217

Adjacent sequences:  A146994 A146995 A146996 * A146998 A146999 A147000

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 19 21:38 EST 2022. Contains 350466 sequences. (Running on oeis4.)