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A067220
Number of n X n 0..12 matrices with all row and column sums equal.
1
1, 13, 169, 112489, 10309971465, 121778484808846083, 193842679171307621077398205
OFFSET
0,2
CROSSREFS
Column k=12 of A202784.
Sequence in context: A020533 A176596 A176023 * A057684 A053153 A167254
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Feb 20 2002
EXTENSIONS
a(5)-a(6) from Sean A. Irvine, Dec 11 2023
a(0)=1 prepended by Andrew Howroyd, Oct 14 2024
STATUS
approved