A053174 - OEIS

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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.

%I #8 Dec 11 2020 06:22:53

%S 228,1596,9660,20988,43284,77028,163452,230796,343788,455628

%N 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.

%F A053170(n) = 2 * (1 + A053171(n) + A053172(n) + A053173(n) + a(n)).

%Y Cf. A053170, A053171, A053172, A053173.

%K nonn,more

%O 1,1

%A _Ralf W. Grosse-Kunstleve_, Mar 26 2000