A162092 Number of n X n symmetric binary arrays with rows, considered as binary numbers, in strictly increasing order, and no more than 2 ones in any row

2, 3, 7, 16, 41, 109, 298, 858, 2533, 7773, 24438, 79079, 261961, 888335, 3078307, 10884541, 39246121, 144089532, 538426333, 2045444718, 7895980672, 30947906902, 123093837504, 496552331743, 2030469580356

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Crossrefs

Sequence in context: A107387 A091487 A247332 * A143884 A227546 A301902

Adjacent sequences: A162089 A162090 A162091 * A162093 A162094 A162095

Keyword

nonn

Author

R. H. Hardin Jun 25 2009

Status

approved