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A360513
Number of deltahedra with 2*n faces.
0
1, 1, 2, 5, 13, 47
OFFSET
2,3
COMMENTS
The terms shown were found by Professor Keh-Ming Lu, Dept. of CSIE, Asia University, Taiwan. Two potentially relevant links are https://geometry.pre-college.narkive.com/JIBdcdER/concave-deltahedra-with-less-than-12-faces and https://www.kehminglu.com/books/.
[It would be nice if someone could look at these URLs and provide proper links. The sequence seems important enough to justify this less-than-perfect preliminary entry.]
LINKS
Antreas Hatzipolakis, Number of Deltahedra, SeqFan Mailing List, Jan 29 2023.
Mathematics Stack Exchange, Counting deltahedra with 2n faces.
Allan Turton, Concave deltahedra with less than 12 faces, NK, geometry.pre-college, 2006.
CROSSREFS
Sequence in context: A085632 A111563 A079573 * A194635 A212821 A067021
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Feb 27 2023
STATUS
approved