A373612 Size of the largest polyiamond that can be enclosed in n cells on a triangular lattice.
0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 6, 6, 6, 7, 7, 10
Offset: 6
Examples
A single triangular face takes 12 triangles to completely enclose so a(12) = 1.