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V. I. Arnold, Singularity Theory, Cambridge Univ. Press, 1981, p. 57.
Table of n, a(n) for n=1..39.
N. J. A. Sloane, Transforms
Sequence in context: A034337 A083024 A003292 * A277271 A192670 A118647
Adjacent sequences: A007861 A007862 A007863 * A007865 A007866 A007867
Peter J. Cameron
Corrected and extended by Vladeta Jovovic, Sep 05 2002