4,1
M. Gardner, Fractal Music, Hypercards and More, Freeman, NY, 1991, p. 240.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=4..11.
a(n) = A002562(n+5). [Vaclav Kotesovec, Sep 07 2012]
Sequence in context: A057454 A211330 A121929 * A004923 A044184 A044565
Adjacent sequences: A007627 A007628 A007629 * A007631 A007632 A007633
nonn
N. J. A. Sloane, Mira Bernstein, Robert G. Wilson v
approved
