2,2

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

S. Plouffe, Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures, Dissertation, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.

S. Muroga, Threshold Logic and Its Applications. Wiley, NY, 1971, p. 268.

S. Plouffe, Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures, Dissertation, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.

S. Plouffe, 1031 Generating Functions and Conjectures, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.

A003218:=-(1-4*z+2*z**3)/(-1+6*z-9*z**2+3*z**3); [Conjectured by S. Plouffe in his 1992 dissertation.]

Adjacent sequences: A003215 A003216 A003217 this_sequence A003219 A003220 A003221

Sequence in context: A099236 A130581 A051236 this_sequence A058770 A049910 A077643

nonn

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