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A141050 Number of n X n binary matrices, symmetric about both diagonal and antidiagonal, with rows, considered as binary numbers, in strictly increasing order. 0
1, 2, 3, 10, 20, 98, 307, 2200, 11253, 122274, 1039587, 17865284, 256702931, 7235318376, 178530216764, 8498781072612, 365328452613008, 30052220838642600 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..19.

CROSSREFS

Sequence in context: A297872 A298135 A226356 * A252865 A252868 A225477

Adjacent sequences:  A141047 A141048 A141049 * A141051 A141052 A141053

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 31 2008

STATUS

approved

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Last modified September 21 01:46 EDT 2021. Contains 347596 sequences. (Running on oeis4.)