A089301 Number of C-types (or contiguity types) of n-dimensional lattices.

1, 1, 1, 1, 3, 76

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: A359500 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