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A053173 Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a four-fold rotation. Also the sequence for the corresponding four-fold rotoinversions. 5
174, 2694, 8814, 23310, 64782, 105678, 171006, 259446, 368334, 599022 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

A053170 = 2 * (1 + A053171 + A053172 + this sequence + A053174).

Sequence in context: A185534 A185526 A248458 * A185525 A224433 A213866

Adjacent sequences:  A053170 A053171 A053172 * A053174 A053175 A053176

KEYWORD

nonn

AUTHOR

Ralf W. Grosse-Kunstleve, Mar 26 2000

STATUS

approved

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Last modified June 23 08:44 EDT 2021. Contains 345395 sequences. (Running on oeis4.)