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A140786 Number of n X n symmetric binary matrices with no more than one greater count of 1's than 0's in and to the left of any position. 0
1, 2, 5, 30, 230, 4600, 118735, 8311450, 756803538, 190714491576, 62835570762274, 58060067384341176, 70381397432713019444, 241548955989071082731808, 1090217292455289464608212443, 14031096553899575409507694141410 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

CROSSREFS

Sequence in context: A209325 A019027 A019031 * A129951 A127298 A275255

Adjacent sequences:  A140783 A140784 A140785 * A140787 A140788 A140789

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 13 2008

STATUS

approved

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Last modified October 2 23:51 EDT 2022. Contains 357230 sequences. (Running on oeis4.)