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Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a three-fold rotation.
5

%I #8 Dec 11 2020 08:07:55

%S 308,1916,9572,20732,43148,73052,155156,219716,331892,440036

%N Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a three-fold rotation.

%F A053170(n) = 2 * (1 + A053171(n) + a(n) + A053173(n) + A053174(n)).

%Y Cf. A053170, A053171, A053173, A053174.

%K nonn,more

%O 1,1

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