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A340341 Number of polymings with n cells, distinguishing mirror images. 0
1, 3, 16, 129, 1009, 8997, 80816, 746483, 6983847, 66146105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A polyming is a generalized polyiamond whose cells may be joined at corners as well as at edges.  I introduced the term in 2010.  In A319324 and elsewhere, David Bevan calls these shapes "polyglasses." In A239658, Abe Wits and Ragnar Groot Koerkamp call them simply "triangular polyplets."

LINKS

Table of n, a(n) for n=1..10.

G. L. Sicherman, Catalogue of Polymings

EXAMPLE

a(3)=16, because there are 11 two-sided 3-mings (identifying mirror images), and 5 of them are chiral.  See the link above.

CROSSREFS

Cf. A239658, A319324.

Sequence in context: A264636 A208829 A289145 * A135752 A218827 A120021

Adjacent sequences:  A340338 A340339 A340340 * A340342 A340343 A340344

KEYWORD

nonn,hard,more

AUTHOR

George Sicherman, Jan 04 2021

STATUS

approved

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Last modified June 16 19:05 EDT 2021. Contains 345068 sequences. (Running on oeis4.)