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A053174
Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a six-fold rotation. Also the sequence for the corresponding six-fold rotoinversions.
5
228, 1596, 9660, 20988, 43284, 77028, 163452, 230796, 343788, 455628
OFFSET
1,1
FORMULA
A053170(n) = 2 * (1 + A053171(n) + A053172(n) + A053173(n) + a(n)).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
STATUS
approved