0,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

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.

Sequence in context: A117313 A080563 A005147 this_sequence A065138 A008841 A038624

Adjacent sequences: A007305 A007306 A007307 this_sequence A007309 A007310 A007311

nonn,hard,nice,bref

N. J. A. Sloane (njas(AT)research.att.com).