A292147 Number of distinct convex pentagons that can be formed from n congruent isosceles right triangles. Reflections are not counted as distinct.

0, 0, 0, 0, 1, 1, 2, 0, 1, 2, 4, 1, 3, 5, 5, 2, 3, 2, 6, 5, 2, 8, 11, 1, 3, 7, 6, 7, 6, 7, 13, 7, 4, 8, 8, 5, 5, 13, 14, 8, 8, 4, 8, 14, 5, 17, 22, 5, 5, 7, 8, 14, 8, 14, 18, 13, 4, 11, 18, 7, 10, 22, 18, 15, 7, 9, 10, 19, 9, 16, 29, 8, 9, 12, 10, 23, 9, 19

Offset

1,7

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 pentagonal polyabolo is for n=5.

Crossrefs

Strictly less than A245676.

Sequence in context: A227318 A166692 A046766 * A003285 A059347 A380971

Adjacent sequences: A292144 A292145 A292146 * A292148 A292149 A292150

Keyword

nonn

Author

Douglas J. Durian, Sep 10 2017

Extensions

a(33) and beyond from Douglas J. Durian, Jan 24 2020

Status

approved