A053172 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A053172

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

5

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

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

FORMULA

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

CROSSREFS

Cf. A053170, A053171, A053173, A053174.

Sequence in context: A249552 A237457 A234211 * A343273 A337955 A091552

Adjacent sequences: A053169 A053170 A053171 * A053173 A053174 A053175

KEYWORD

nonn,more

AUTHOR

Ralf W. Grosse-Kunstleve, Mar 26 2000

STATUS

approved