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A162035 Number of n X n binary arrays with rows and columns, considered as binary numbers, in nondecreasing order, and all main diagonal and antidiagonal elements zero 1
1, 1, 2, 5, 40, 305, 12691, 293917, 64666609, 4777061942, 5265804443700, 1328477888564856, 6827179524158309476, 6237767322227211160135, 140927471183914959653326558, 485894738692896067839001296906 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

R. H. Hardin, Table of n, a(n) for n=1..20

CROSSREFS

Sequence in context: A127974 A012801 A183910 * A245242 A004096 A156152

Adjacent sequences:  A162032 A162033 A162034 * A162036 A162037 A162038

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 25 2009

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)