Number T(n,k) of equivalence classes of ways of placing k 3 X 3 tiles in an n X 9 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=3, 0<=k<=2*floor(n/3), read by rows.
A238582
Number T(n,k) of equivalence classes of ways of placing k 3 X 3 tiles in an n X 9 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=3, 0<=k<=2*floor(n/3), read by rows.
Terms
- a(0) =1a(1) =4a(2) =6a(3) =1a(4) =1a(5) =4a(6) =12a(7) =3a(8) =1a(9) =8a(10) =28a(11) =10a(12) =1a(13) =8a(14) =54a(15) =82a(16) =49a(17) =8a(18) =1a(19) =1a(20) =12a(21) =95a(22) =283a(23) =311a(24) =91a(25) =10a(26) =1a(27) =12a(28) =146a(29) =647
External references
- oeis: A238582