OFFSET
0,2
COMMENTS
N points are chosen on a circle to get n arcs of different lengths. Then a(n-1) counts - Anton Zakharov, Dec 14 2016
FORMULA
For n>2, a(n)=2^n. - Ray Chandler, Aug 21 2003
Row sums of triangle A132309. - Gary W. Adamson, Aug 18 2007
EXAMPLE
Triangle begins
1
2 3
2 4 8
2 4 8 16
2 4 8 16 32
MATHEMATICA
Table[2^(n + 1) - Boole[n < 2], {n, 0, 30}] (* Michael De Vlieger, Mar 15 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Nov 10 2002
EXTENSIONS
Corrected and extended by Ray Chandler, Aug 21 2003
STATUS
approved