2,1

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).

N. Metropolis and P. R. Stein, An elementary solution to a problem in restricted partitions, J. Combin. Theory, 9 (1970), 365-376.

Sequence in context: A149584 A147324 A109245 this_sequence A007714 A123011 A006358

Adjacent sequences: A002218 A002219 A002220 this_sequence A002222 A002223 A002224

nonn

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