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A089301 Number of C-types (or contiguity types) of n-dimensional lattices. 0
1, 1, 1, 1, 3, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

REFERENCES

Ryskov, S. S., C-types of n-dimensional parallelohedra, Dokl. Akad. Nauk SSSR 212 (1973), 46-49.

Ryskov, S. S. and Baranovskii, E. P., C-types of n-dimensional lattices and 5-dimensional primitive parallelohedra (with application to the theory of coverings), Trudy Mat. Inst. Steklov 137 (1976). English translation: Proc. Steklov Inst. Math. 1978, no. 4, 140 pp.

LINKS

Table of n, a(n) for n=0..5.

CROSSREFS

Cf. A071880, A071881, A071882.

Sequence in context: A320306 A238000 A308866 * A037110 A168385 A042267

Adjacent sequences:  A089298 A089299 A089300 * A089302 A089303 A089304

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane, following a suggestion of J. H. Conway, Dec 26, 2003

STATUS

approved

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Last modified May 27 12:49 EDT 2022. Contains 354097 sequences. (Running on oeis4.)