Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a six-fold rotation. Also the sequence for the corresponding six-fold rotoinversions.
A053174
Number of 3 X 3 integer matrices with elements in the range [ -n,n ] which represent a six-fold rotation. Also the sequence for the corresponding six-fold rotoinversions.
Terms
- a(0) =228a(1) =1596a(2) =9660a(3) =20988a(4) =43284a(5) =77028a(6) =163452a(7) =230796a(8) =343788a(9) =455628a(10) =623844a(11) =809604a(12) =1167060a(13) =1464564a(14) =1857708a(15) =2205564a(16) =2702412a(17) =3154140a(18) =4011612a(19) =4581132a(20) =5853684a(21) =6598356a(22) =7608564a(23) =8582796a(24) =9785388a(25) =11012316a(26) =12512076a(27) =13933884a(28) =15643500a(29) =17200572
External references
- oeis: A053174