a too-short sequence related to Latin squares
Paul D Hanna
pauldhanna at juno.com
Fri Sep 3 19:10:43 CEST 2004
Perhaps an interesting variation of this theme
would be the number of such n X n squares
with non-zero determinant?
Paul
-- "N. J. A. Sloane" <njas at research.att.com> wrote:
Dear Seqfans, is the following sequence already
in the OEIS? one more term would be helpful!
Neil
How many n X n squares are there, filled with
the numbers 1...n, such that in row or column k,
for all k = 1...n, the number k appears at least once?
For n = 1 there is just 1,
for n = 2 there seem to be 6
namely
11 11 12 12 12 21
12 22 12 21 22 12
More information about the SeqFan
mailing list