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: A151874 A048044 A047188 this_sequence A090578 A007713 A058488

Adjacent sequences: A002217 A002218 A002219 this_sequence A002221 A002222 A002223

nonn

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