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A002395 a(n) is the number of crystal forms in n dimensions. 0
1, 2, 9, 47 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(3) is 47 or 48 depending on the classification used (whether dome and sphenoid are distinguished). Engel and the International Tables give 47. - Andrey Zabolotskiy, Nov 27 2017

REFERENCES

P. Engel, "Geometric crystallography", in P. M. Gruber and J. M. Wills, editors, Handbook of Convex Geometry. North-Holland, Amsterdam, Vol. B, pp. 989-1041.

IUCr, The International Tables for Crystallography, Volume A, Table 10.1.2.3 in 2006 edition or Table 3.2.1.3 in 2016 edition.

LINKS

Table of n, a(n) for n=0..3.

Steven Dutch, The 48 Special Crystal Forms

Online Dictionary of Crystallography, Form

CROSSREFS

Sequence in context: A032331 A049371 A032079 * A042793 A059272 A228341

Adjacent sequences:  A002392 A002393 A002394 * A002396 A002397 A002398

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified November 15 22:20 EST 2018. Contains 317252 sequences. (Running on oeis4.)