0,2

J. M. Alonso, Growth functions of amalgams, in Alperin, ed., Arboreal Group Theory, Springer, pp. 1-34, esp. p. 32.

P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 160, middle display.

Sequence in context: A035804 A017739 A116264 this_sequence A049669 A139671 A098606

Adjacent sequences: A004296 A004297 A004298 this_sequence A004300 A004301 A004302

nonn

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