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

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

0,1

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

Table of n, a(n) for n=0..52.

Index entries for sequences obtained by enumerating foldings

Crossrefs

Cf. A023359, A088585.

Sequence in context: A016288 A016030 A123271 * A321753 A186032 A212157

Adjacent sequences: A121235 A121236 A121237 * A121239 A121240 A121241

Keyword

sign

Author

Philippe Deléham, Aug 21 2006

Status

approved