1,2

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

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

Gadi Aleksandrowicz and Gill Barequet, Counting d-Dimensional Polycubes and Nonrectangular Polyominoes, in Computing and Combinatorics, Lecture Notes in Computer Science, Volume 4112, 2006, pp. 418-427, Springer-Verlag. [From N. J. A. Sloane, Jul 09 2009]

W. F. Lunnon, Symmetry of cubical and general polyominoes, pp. 101-108 of R. C. Read, editor, Graph Theory and Computing. Academic Press, NY, 1972.

D. H. Redelmeier, personal communication.

Cf. A001420, A151830-A151835.

Sequence in context: A084209 A127085 A093615 this_sequence A075841 A152596 A089022

Adjacent sequences: A001928 A001929 A001930 this_sequence A001932 A001933 A001934

nonn,nice

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

a(17) from Achim Flammenkamp (achim(AT)uni-bielefeld.de) Feb 15 1999.

a(18) from the Aleksandrowicz and Barequet paper (N. J. A. Sloane, Jul 09 2009)