OFFSET
1,13
COMMENTS
Is this sequence bounded?
Are there infinitely many null values?
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
Rémy Sigrist, Scatterplot of the first 25000000 terms
Rémy Sigrist, C program for A308638
EXAMPLE
The first terms, alongside the values of k such that (n-1-2*k, a(n-1-2*k)), (n-1-k, a(n-1-k)) and (n-1, a(n-1)), are:
n a(n) k's
-- ---- -----
1 0 none
2 0 none
3 0 none
4 1 1
5 0 none
6 1 2
7 0 none
8 1 2
9 1 2
10 0 none
11 0 none
12 1 4
13 2 3,4
14 3 1,4,5
PROG
(C) See Links section.
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Rémy Sigrist, Jun 13 2019
STATUS
approved