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A005163 Number of alternating sign n X n matrices that are symmetric about a diagonal.
(Formerly M1500) 		+0
1
1, 2, 5, 16, 67, 368, 2630, 24376, 293770, 4610624, 94080653, 2492747656, 85827875506, 3842929319936, 223624506056156, 16901839470598576, 1659776507866213636, 211853506422044996288, 35137231473111223912310, 7569998079873075147860464 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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