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A140964 Number of n X n symmetric binary matrices with each 1 adjacent to an odd number of other 1's. 1
1, 1, 3, 10, 47, 331, 3767, 62520, 1518009, 55743394, 3088601538, 255245736384, 31478354074963, 5821763616950936, 1613533542340366588, 669043996295174916639, 415143729274794925159205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

R. H. Hardin, Jul 27 2008, Table of n, a(n) for n = 1..21

CROSSREFS

Sequence in context: A339836 A105748 A277746 * A220362 A005921 A193281

Adjacent sequences:  A140961 A140962 A140963 * A140965 A140966 A140967

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 27 2008

STATUS

approved

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Last modified April 16 10:41 EDT 2021. Contains 343036 sequences. (Running on oeis4.)