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From Lyman antispectrum of hydrogen.
Table of n, a(n) for n=-1..45.
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).
a(n) = A000290(n), n>=0.
(PARI) a(n)=n^2 \\ Charles R Greathouse IV, Nov 26 2012
Main sequence is A000290.
Sequence in context: A216500 A069821 A174452 * A000290 A162395 A253909
Adjacent sequences: A174899 A174900 A174901 * A174903 A174904 A174905
Paul Curtz, Dec 02 2010