OFFSET
1,2
COMMENTS
An addition triangle has any set of positive numbers as base; other rows are formed by adding pairs of adjacent numbers.
Reversing the base does not count as a different triangle.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..200
EXAMPLE
For n = 5:
5
2,3 5 5
1,1,2 4,1 2,3 5.
with four different bases, so a(5) = 4.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Naohiro Nomoto, Feb 11 2002
EXTENSIONS
Extended and edited by John W. Layman, Feb 14 2002
STATUS
approved