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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A121238 a(n) = (-1)^(1+n+A088585(n)).

Original entry on oeis.org

1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1
Offset: 0

Views

Author

Philippe Deléham, Aug 21 2006

Keywords

Comments

Apparently the partial products of this sequence form the Hankel transform of A023359: 1, 1*1 = 1, 1*1*1 = 1, 1*1*1*-1 = -1, 1*1*1*-1*1 = -1, ... and 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, -1, ... is the Hankel transform of A023359.

Links

Crossrefs

Cf. A023359, A088585.

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