A003191 Number of symmetric Latin squares of order 2n with constant diagonal. (Formerly M4318)

1, 1, 6, 5972, 1225533120

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