A141051 Number of symmetric n X n binary matrices with rows, considered as binary numbers, in strictly increasing order.

3, 9, 48, 438, 6774, 178263, 8064528, 635233629, 88262479353, 21895746114393, 9802094635734609, 7991530444822867188, 11958178763325581795193, 33058393812927903895526529, 169791780269023089222297799203, 1628050027945868401705569575523453

Offset

2,1

Links

Table of n, a(n) for n=2..17.

Crossrefs

Sequence in context: A183952 A298308 A370426 * A001530 A316449 A356270

Adjacent sequences: A141048 A141049 A141050 * A141052 A141053 A141054

Keyword

nonn

Author

R. H. Hardin, Jul 31 2008

Status

approved