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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

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 January 20 12:50 EST 2019. Contains 319330 sequences. (Running on oeis4.)