A376899 Total number of ways a triangle of order n can be completely surrounded by a specific pentiamond.

160, 24, 27, 8, 0, 0, 0

Offset

1,1

Comments

The coronal expansion number is defined to be the number of expansions the central host frame can undergo and still have a corona formed by the coronal tile. The coronal expansion number is 4 for this sequence. See the links section for an example of a pseudo-triangle as the central host frame that has a coronal expansion number of 7. Craig Knecht, Oct 31 2024

Links

Table of n, a(n) for n=1..7.

Craig Knecht, Pseudo triangle with a coronal expansion number of 7.

Craig Knecht, The 160 ways this pentiamond can surround a T1 triangle.

Craig Knecht, T2, T3, and T4 surrounded by this pentiamond.

Crossrefs

Sequence in context: A013455 A013465 A013466 * A060675 A171225 A290463

Adjacent sequences: A376896 A376897 A376898 * A376900 A376901 A376902

Keyword

nonn,more

Author

Craig Knecht, Oct 08 2024

Status

approved