A385272 Number of face-connected components of phyllic disphenoidal cells in the phyllic disphenoidal honeycomb up to translation, rotation, and reflection of the honeycomb.

1, 1, 2, 4, 13, 38, 141, 515, 2043, 8176, 33706, 140471, 593705, 2531933, 10893811, 47202599, 205843902, 902644191, 3977976135, 17609163491

Offset

0,3

Comments

These are "free polyforms" because they are counted up to rotation and reflection.

The "phyllic disphenoidal honeycomb" is also called the "eighth pyramidille," and its dual is the omnitruncated cubic honeycomb.

The phyllic disphenoidal cells are similar to the convex hull of (0,0,0), (1,0,0), (1,1,0), and (1,1,1).

Links

Table of n, a(n) for n=0..19.

Peter Kagey, Animation illustrating the a(5)=38 connected 5-cell components.

Wikipedia, Architectonic and catoptric tessellation

Wikipedia, Tetragonal disphenoid honeycomb, see section "Phyllic disphenoidal honeycomb."

Crossrefs

Cf. A038119 (cubic), A038173 (rhombic dodecahedral), A038181 (truncated octahedral), A343909 (tetrahedral-octahedral), A365654 (square bipyramidal), A384254 (rectified cubic), A384274 (quarter cubic), A384754 (omnitruncated cubic), A385024 (tetragonal disphenoidal), A385025 (gyrobifastigium), A385026 (hexagonal prismatic), A385027 (triakis truncated tetrahedral), A385267 (half pyramidille), A385268 (oblate cubille), A385269 (quarter cubille), A385270 (elongated dodecahedral), A385271 (hexakis cubic), A385272 (phyllic disphenoidal), A385273 (quarter oblate octahedrille), A385274 (rhombic pyramidal), A385275 (square quarter pyramidille), A385276 (trapezo-rhombic dodecahedral), A385277 (triangular prismatic).

Sequence in context: A174604 A394068 A148253 * A392392 A148254 A163137

Adjacent sequences: A385269 A385270 A385271 * A385273 A385274 A385275

Keyword

nonn,hard,more

Author

Peter Kagey and Bert Dobbelaere, Jun 25 2025

Status

approved