OFFSET
1,1
COMMENTS
For n>=3, a(n) = sqrt(2*a(n-1)^2 + (-2)^(n-3)), with a(2) = 12. Unlike the Graham-Pollack formula given in A001521, this formula does not use the floor function. - Richard R. Forberg, Aug 20 2013
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..500
Th. Stoll, On Families of Nonlinear Recurrences Related to Digits, Journal of Integer Sequences, Vol. 8 (2005), Article 05.3.2.
Eric Weisstein's World of Mathematics, Graham-Pollak Sequence
FORMULA
See A001521.
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Jan 18 2004
STATUS
approved