Number T(n,k) of equivalence classes of ways of placing k 3 X 3 tiles in an n X 7 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=3, 0<=k<=2*floor(n/3), read by rows.
A238556
Number T(n,k) of equivalence classes of ways of placing k 3 X 3 tiles in an n X 7 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) =3a(2) =2a(3) =1a(4) =3a(5) =4a(6) =1a(7) =6a(8) =9a(9) =1a(10) =6a(11) =21a(12) =13a(13) =4a(14) =1a(15) =9a(16) =39a(17) =53a(18) =23a(19) =1a(20) =9a(21) =64a(22) =128a(23) =87a(24) =1a(25) =12a(26) =95a(27) =283a(28) =311a(29) =91
External references
- oeis: A238556