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

1, 1, 1, 1, 3, 76

Offset: 0

Author

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

Keywords

• nonn
• hard
• nice

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.

Crossrefs

Cf. A071880, A071881, A071882.