A162109 Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order

2, 4, 9, 56, 499, 8000, 207554, 9382078, 732814910, 101599273769, 25151730678684, 11252735518379960, 9169484084583765409, 13716523699765295956974, 37907229783585348802398136, 194640906178869631364050052914

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Crossrefs

Sequence in context: A162115 A162116 A162117 * A271553 A067603 A269739

Adjacent sequences: A162106 A162107 A162108 * A162110 A162111 A162112

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved