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A162034 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all main diagonal and antidiagonal elements zero 1
1, 1, 2, 3, 10, 23, 161, 643, 10399, 76674, 2793020, 39088170, 3075920130, 83293952237, 13726688369636, 728989553713898, 246651220048842038, 25910326192430212792, 17788328684183351444219, 3714881265827493365084899 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

R. H. Hardin, Table of n, a(n) for n=1..23

CROSSREFS

Sequence in context: A089880 A130002 A320812 * A105286 A295616 A059929

Adjacent sequences:  A162031 A162032 A162033 * A162035 A162036 A162037

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 25 2009

STATUS

approved

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Last modified October 17 01:03 EDT 2019. Contains 328103 sequences. (Running on oeis4.)