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.
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.
Terms
- a(0) =174a(1) =2694a(2) =8814a(3) =23310a(4) =64782a(5) =105678a(6) =171006a(7) =259446a(8) =368334a(9) =599022a(10) =795822a(11) =1024494a(12) =1428558a(13) =1770486a(14) =2227758a(15) =2718438a(16) =3460638a(17) =4057806a(18) =4781310a(19) =5790102a(20) =6667998a(21) =7661478a(22) =8804694a(23) =9944862a(24) =11881182a(25) =13904670a(26) =15454974a(27) =17264142a(28) =19755294a(29) =22075086
External references
- oeis: A053173