6,2

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

Altshuler, A.; Steinberg, L.; An enumeration of combinatorial 3-manifolds with nine vertices. Discrete Math. 16 (1976), no. 2, 91-108.

Sequence in context: A129581 A120055 A076818 this_sequence A123745 A053426 A120083

Adjacent sequences: A005023 A005024 A005025 this_sequence A005027 A005028 A005029

nonn

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