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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

CROSSREFS

Sequence in context: A020533 A176596 A176023 * A057684 A053153 A167254

Adjacent sequences:  A067217 A067218 A067219 * A067221 A067222 A067223

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2002

STATUS

approved

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Last modified January 26 10:01 EST 2022. Contains 350598 sequences. (Running on oeis4.)