A292149 Number of distinct convex heptagons that can be formed from n congruent isosceles right triangles. Reflections are not counted as distinct.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 2, 1, 1, 3, 2, 1, 3, 2, 3, 1, 4, 6, 3, 3, 3, 3, 8, 1, 8, 11, 3, 4, 5, 8, 9, 5, 11, 8, 11, 6, 10, 13, 8, 9, 11, 17, 13, 6, 14, 11, 21, 8, 15, 25, 13, 12, 17, 20, 22, 12, 18, 24, 22, 13, 27, 27

Offset

1,23

Comments

Illustrated with other convex polyabolos in A245676.

Links

Douglas J. Durian, Table of n, a(n) for n = 1..750

Example

The smallest convex heptagonal polyabolos are for n = 15 (symmetrical) and n = 17 (asymmetrical).

Crossrefs

Strictly less than A245676.

Sequence in context: A280073 A327523 A190770 * A275676 A025831 A184751

Adjacent sequences: A292146 A292147 A292148 * A292150 A292151 A292152

Keyword

nonn

Author

Douglas J. Durian, Sep 13 2017

Extensions

a(33) and beyond from Douglas J. Durian, Jan 25 2020

Status

approved