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A146864 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-1111 pattern in any orientation. +0
1
1, 1, 1, 1, 9, 13, 33, 41, 1409, 3235, 90107, 256175, 6239335, 21132187, 2159343451, 9249857635, 1354374350659, 7148183873103, 1813815982643009, 11749437543357083, 7025171720330773661, 56366719637660576905 (list; graph; listen)
OFFSET

1,5

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.1.0.0.1.1.0

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A032361 A031196 A151725 this_sequence A146739 A146723 A146422

Adjacent sequences: A146861 A146862 A146863 this_sequence A146865 A146866 A146867

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.


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