A147044 - OEIS

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A147044

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 57, 101, 713, 1409, 16209, 36805, 1045937, 2912737, 187227785, 638780181, 63010306161, 259616518697, 40933920799465, 203480267447389, 59661340540245489, 359399633370402801, 191689597051107880169

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A111320 A147468 A147036 * A366206 A237663 A039535

Adjacent sequences: A147041 A147042 A147043 * A147045 A147046 A147047

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved