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A003191 Number of symmetric Latin squares of order 2n with constant diagonal.
(Formerly M4318)
6
1, 1, 6, 5972, 1225533120 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
REFERENCES
N. T. Gridgeman, Latin squares under restriction and a jumboization, J. Rec. Math., 5 (No. 3, 1972), 198-202.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
CROSSREFS
Sequence in context: A172649 A111152 A202969 * A298272 A000438 A061109
KEYWORD
nonn,hard,nice
AUTHOR
EXTENSIONS
Daniele Degiorgi (degiorgi(AT)inf.ethz.ch) suggests that this is an erroneous version of A000438.
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)