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A067220
Number of n X n 0..12 matrices with all row and column sums equal.
1
13, 169, 112489, 10309971465, 121778484808846083, 193842679171307621077398205
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..6.
CROSSREFS
Sequence in context:
A020533
A176596
A176023
*
A057684
A053153
A167254
Adjacent sequences:
A067217
A067218
A067219
*
A067221
A067222
A067223
KEYWORD
nonn
,
more
AUTHOR
R. H. Hardin
, Feb 20 2002
EXTENSIONS
a(5)-a(6) from
Sean A. Irvine
, Dec 11 2023
STATUS
approved
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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)