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.

174, 2694, 8814, 23310, 64782, 105678, 171006, 259446, 368334, 599022, 795822, 1024494, 1428558, 1770486, 2227758, 2718438, 3460638, 4057806, 4781310, 5790102, 6667998, 7661478, 8804694, 9944862, 11881182, 13904670, 15454974, 17264142, 19755294, 22075086

Offset

1,1

Links

Table of n, a(n) for n=1..30.

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

Extensions

a(11)-a(30) from Bert Dobbelaere, Apr 18 2025

Status

approved