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A308748
a(n) is the maximum number of pentagonal polyiamond divisions of an equilateral triangle of order n when tiling with the two smallest pentagonal polyiamonds.
1
0, 0, 0, 0, 0, 0, 9, 12, 15, 18, 23, 28, 32, 38, 44, 50, 57
OFFSET
1,7
COMMENTS
The two smallest pentagonal polyiamonds contain five and six unit triangles. All internal angles are either 60, 120 or 240 degrees.
Order five and six equilateral triangle pentagonal tilings require pentagonal tiles larger than hexiamonds.
CROSSREFS
Cf. A002061.
Sequence in context: A365408 A161345 A102655 * A120167 A263674 A337701
KEYWORD
nonn,more
AUTHOR
Craig Knecht, Jun 21 2019
STATUS
approved