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A337415
a(n) is the number of ways to tile a size n triangle in the triangular grid with n n-cell polyiamonds, up to rotation and reflection of the triangle.
1
1, 0, 1, 3, 11, 314
OFFSET
1,4
COMMENTS
The initial values are computed via the program from Arnauld Chevallier in the Code Golf Stack Exchange link.
EXAMPLE
An example of the a(4) = 3 essentially different ways of tiling a size 4 triangle with 4-iamonds can be found via the Code Golf Stack Exchange link.
CROSSREFS
A328020 is the analog for square on the square grid.
Cf. A000577.
Sequence in context: A373342 A097423 A111130 * A264725 A374558 A088579
KEYWORD
nonn,more,hard
AUTHOR
Peter Kagey and Alec Jones, Aug 26 2020
STATUS
approved