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Search: id:A162028
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A162028 Number of nXn symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all but the outermost 2 rows or columns zero +0
1
86, 393, 1319, 4133, 12139, 33357, 85798, 207283, 472758, 1023449, 2114041, 4186441, 7981693, 14705357, 26266256, 45614055, 77207792, 127655369, 206573275, 327726605, 510521919, 781939821, 1179010506, 1751954107, 2568128666 (list; graph; listen)
OFFSET

4,1

LINKS

R. H. Hardin, Table of n, a(n) for n=4..100

CROSSREFS

Sequence in context: A097693 A113690 A043379 this_sequence A157443 A035136 A128957

Adjacent sequences: A162025 A162026 A162027 this_sequence A162029 A162030 A162031

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jun 25 2009

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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