A162074 Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and an even number of ones in each row

1, 2, 3, 8, 31, 187, 2283, 42743, 1641965, 103253028, 12810578372, 2750743641417, 1126452639815250, 830354090187673737, 1152099822267599547753

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Crossrefs

Sequence in context: A372711 A160586 A340935 * A162052 A082569 A340495

Adjacent sequences: A162071 A162072 A162073 * A162075 A162076 A162077

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved