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Essentially a (1,-1) Somos-4 sequence.
Table of n, a(n) for n=0..29.
Sequence in context: A201615 A033640 A112027 * A178079 A258987 A174254
Adjacent sequences: A174397 A174398 A174399 * A174401 A174402 A174403
Paul Barry, Mar 18 2010