A162093 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 3 ones in any row

2, 3, 9, 41, 205, 1190, 7529, 51751, 387737, 3113542, 26765060, 244702054, 2367701249, 24169612036, 259289525510, 2915165124175, 34258966408875

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Crossrefs

Sequence in context: A328436 A125052 A181139 * A052828 A214915 A219673

Adjacent sequences: A162090 A162091 A162092 * A162094 A162095 A162096

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved