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Search: id:A145790
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A145790 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either four adjacent vertically or four adjacent horizontally. +0
1
1, 1, 1, 9, 11, 36, 65, 515, 2420, 18065, 172108, 1981958, 24609296, 431265080, 7420809238, 183434050306, 4983211868325, 173511007323269, 7989094384834315, 376330135051842303, 28830157229045747299, 1923394214566012353119 (list; graph; listen)
OFFSET

1,4
CROSSREFS

Sequence in context: A130730 A153697 A129399 this_sequence A143465 A116152 A108687

Adjacent sequences: A145787 A145788 A145789 this_sequence A145791 A145792 A145793

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Oct 19 2008

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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