Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Nov 04 2013 12:37:04
%S 1,1,1,1,3,76
%N Number of C-types (or contiguity types) of n-dimensional lattices.
%D Ryskov, S. S., C-types of n-dimensional parallelohedra, Dokl. Akad. Nauk SSSR 212 (1973), 46-49.
%D 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.
%Y Cf. A071880, A071881, A071882.
%K nonn,hard,nice
%O 0,5
%A _N. J. A. Sloane_, following a suggestion of _J. H. Conway_, Dec 26, 2003