OFFSET
1,3
COMMENTS
The integers can be placed as points on an elliptic curve so that all zero-sum triples are collinear. The sequence gives the placement position and sign for the integer n.
LINKS
EXAMPLE
1 in (1) at place 1. Position (-5,-3).
2 in (-2,1) at place -1, indicating negative. Position (-1,-1).
3 in (-2,3,1) at place 2. Position (-3,-1).
4 in (-2,-4,3,1) at place -2. Position (0,-2).
5 in (-2,-4,5,3,1) at place 3. Position (-5,1).
6 in (-2,-4,-6,5,3,1) at place -3. Position (5,-3).
7 in (-2,-4,7,-6,5,3,1) at place 3. Position (-3,3).
8 in (-2,-4,7,-6,5,-8,3,1) at place -6. Position (4,0).
The placements give sequence 1, -1, 2, -2, 3, -3, 3, -6, ...
CROSSREFS
KEYWORD
sign
AUTHOR
Ed Pegg Jr, Oct 19 2017
STATUS
approved