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.

0

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