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A003191
Number of symmetric Latin squares of order 2n with constant diagonal.
(Formerly M4318)
6
1, 1, 6, 5972, 1225533120
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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
Table of n, a(n) for n=1..5.
Index entries for sequences related to Latin squares and rectangles
CROSSREFS
Sequence in context:
A172649
A111152
A202969
*
A298272
A000438
A061109
Adjacent sequences:
A003188
A003189
A003190
*
A003192
A003193
A003194
KEYWORD
nonn
,
hard
,
nice
AUTHOR
N. J. A. Sloane
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.)