2,1

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

W.-K. Chen and I. C. Goyal, Tables of essential complementary partitions, IEEE Trans. Circuit Theory, 18 (1971), 562-563.

Sequence in context: A089104 A050398 A135081 this_sequence A110083 A086922 A007128

Adjacent sequences: A007331 A007332 A007333 this_sequence A007335 A007336 A007337

nonn

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