The number of tilings of an equilateral triangle of side length n with k lozenges and n^2 - 2*k unit triangles. Triangle T(n, k) with n >= 1 and 0 <= k <= n*(n + 1)/2, read by rows.
A273464
The number of tilings of an equilateral triangle of side length n with k lozenges and n^2 - 2*k unit triangles. Triangle T(n, k) with n >= 1 and 0 <= k <= n*(n + 1)/2, read by rows.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =9a(5) =24a(6) =18a(7) =1a(8) =18a(9) =126a(10) =434a(11) =762a(12) =630a(13) =187a(14) =1a(15) =30a(16) =387a(17) =2814a(18) =12699a(19) =36894a(20) =69242a(21) =81936a(22) =57672a(23) =21432a(24) =3135a(25) =1a(26) =45a(27) =915a(28) =11127a(29) =90270
External references
- oeis: A273464