Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a rotation of order 2.

A053171

Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a rotation of order 2.

Terms

    a(0) =81a(1) =321a(2) =825a(3) =1689a(4) =2601a(5) =4185a(6) =5529a(7) =8145a(8) =10401a(9) =13137a(10) =15345a(11) =20577a(12) =23265a(13) =27057a(14) =32529a(15) =39057a(16) =42585a(17) =48993a(18) =53097a(19) =61881a(20) =69753a(21) =75993a(22) =80745a(23) =96297a(24) =103497a(25) =110745a(26) =119241a(27) =131865a(28) =138345a(29) =154089

External references