0,1

See the reference for precise definition.

The g.f. 2*(1-2*z+2*z**2)/(-1+2*z)/(z-1) conjectured by S. Plouffe in his 1992 dissertation is unlikely to be correct.

T. Curtright, ``Counting symmetry patterns in the spectra of strings,'' in H. J. de Vega and N. S\'{a}nchez, editors, String Theory, Quantum Cosmology and Quantum Gravity. Integrable and Conformal Invariant Theories. World Scientific, Singapore, 1987, pp. 304-333.

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.

Adjacent sequences: A005307 A005308 A005309 this_sequence A005311 A005312 A005313

Sequence in context: A019101 A051890 A071109 this_sequence A002203 A097341 A014431

nonn

njas