1,3

F. C. S. Brown, T. M. A. Fink and K. Willbrand, On arithmetic and asymptotic properties of up-down numbers

E.g.f.: 1/2 [z/(1-z) + tanh(z) ].

Sequence in context: A020062 A000954 A056636 this_sequence A078839 A026306 A116398

Adjacent sequences: A128100 A128101 A128102 this_sequence A128104 A128105 A128106

nonn

Ralf Stephan, May 09 2007