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.

1, 2, 5, 30, 230, 4600, 118735, 8311450, 756803538, 190714491576, 62835570762274, 58060067384341176, 70381397432713019444, 241548955989071082731808, 1090217292455289464608212443, 14031096553899575409507694141410

Offset

0,2

Links

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

Crossrefs

Sequence in context: A019027 A019031 A366455 * A369726 A129951 A127298

Adjacent sequences: A140783 A140784 A140785 * A140787 A140788 A140789

Keyword

nonn

Author

R. H. Hardin, Jul 13 2008

Status

approved