OFFSET
1,4
COMMENTS
See A232890 for the corresponding denominators and additional comments.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..1000
Rémy Sigrist, PARI program for A281426
Rémy Sigrist, Scatterplot of A232890 vs A281426 for n=1..10000
EXAMPLE
To generate S, the number 0 begets (1,-1), whence 1 begets 2 and -1/2, whereas -1 begets 0 and -1/2, both of which are (deleted )duplicates, so that g(3) = (2, -1/2). The resulting concatenation of all the generations g(n) begins with 0, 1, -1, 2, -1/2, 3, -1/3, 1/2, -2, 4, -1/4, so that A232890 begins with 0, 1, -1, 2, -1, 3, -1, 1, -2, 4.
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
frac,sign
AUTHOR
Rémy Sigrist, Oct 05 2017
STATUS
approved