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: A088556 A137966 A005498 this_sequence A006359 A001553 A009247

Adjacent sequences: A002219 A002220 A002221 this_sequence A002223 A002224 A002225

nonn

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