A141049 - OEIS

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A141049

Number of n X n binary matrices, symmetric under 180 degree rotation, with rows, considered as binary numbers, in strictly increasing order.

1, 2, 3, 32, 138, 4080, 59524, 4687776, 225124336, 51271450616, 8343603385400, 5906858359525200, 3340333500963917624, 7785349019265044794432

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OFFSET

2,2

LINKS

Table of n, a(n) for n=2..15.

CROSSREFS

Sequence in context: A212763 A103108 A107124 * A354612 A052830 A357265

Adjacent sequences: A141046 A141047 A141048 * A141050 A141051 A141052

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 31 2008

STATUS

approved