OFFSET
0,3
LINKS
EXAMPLE
{}=0, {1}=1, {3}=3, {1+3}=4, {8}=8, {1+8}=9, {3+8}=11, {1+3+8}=12, etc.
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Feb 26 2002
STATUS
approved