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A159223
Number of n X n arrays of squares of integers with every 3X3 subblock summing to 21
0
7182, 81970, 467006, 1871442, 9915518, 40057258, 143026182, 684920266, 2780241662, 10567815570
OFFSET
3,1
CROSSREFS
Sequence in context: A279529 A237394 A028541 * A143193 A064979 A348807
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 06 2009
STATUS
approved