1,1

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

Problem #139, An Enumeration Problem" by David L. Silverman, J. Rec. Math., 8 (1976), 323-327.

Index entries for sequences related to dominoes

Sequence in context: A052945 A026288 A047086 this_sequence A053419 A079227 A148314

Adjacent sequences: A006571 A006572 A006573 this_sequence A006575 A006576 A006577

nonn

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