

A117154


Floretion with FAMP code 1teszapsumseq[C*B] with C =  .5'j + .5'k  .5j' + .5k'  'ii'  .5'ij'  .5'ik'  .5'ji'  .5'ki' and B =  .5'i + .5'j  .5i' + .5j'  'kk'  .5'ik'  .5'jk'  .5'ki'  .5'kj'.


2



1, 0, 0, 1, 1, 2, 0, 1, 0, 0, 1, 1, 2, 2, 1, 2, 0, 1, 0, 0, 1, 1, 2, 2, 3, 4, 2, 3, 2, 2, 1, 2, 0, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 4, 4, 3, 4, 2, 3, 2, 2, 1, 2, 0, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 5, 6, 4, 5, 4, 4, 3, 4, 2, 3, 2, 2
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OFFSET

1,6


COMMENTS

The following parity property of this sequence seems interesting: Assume 0 is both positive and negative and let sgn(a(n)) be the sign of a(n). Then apparently sgn(a(n)) = sgn(a(n+1)) = sgn(a(n+2)) for all n. But sgn(a(2n)) != sgn(a(2m)) for all n,m.


LINKS

Creighton Dement, First 821 terms [after this it alternates 39, 39, 39, 39 forever]
Creighton Dement, Notes on A126626 and A117154
Index entries for linear recurrences with constant coefficients, signature (1).


CROSSREFS

Sequence in context: A307056 A112762 A145171 * A074941 A171774 A002324
Adjacent sequences: A117151 A117152 A117153 * A117155 A117156 A117157


KEYWORD

sign,easy,hear


AUTHOR

Creighton Dement, Apr 21 2006


STATUS

approved



