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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=2..15.
T. L. Curtright and C. B. Thorn, Symmetry patterns in the mass spectra of dual string models, Nuclear Phys. B 274 (1986), 520-588.
Sequence in context: A118680 A094116 A079476 * A063692 A123209 A123604
Adjacent sequences: A005295 A005296 A005297 * A005299 A005300 A005301
N. J. A. Sloane.