2,1

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

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

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

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).