OFFSET
1,3
LINKS
Gheorghe Coserea, Table of n, a(n) for n = 1..1535
FORMULA
a(n) ~ 4*K/sqrt(Pi) * 4^n/n^2, where K = 0.2675... (see A265180). - Gheorghe Coserea, Dec 05 2015
EXAMPLE
For n=4, a(4)=7 because T(4,1)=1, T(4,2)=7, T(4,3)=5, T(4,4)=1.
CROSSREFS
KEYWORD
nonn,walk
AUTHOR
Gheorghe Coserea, Jul 07 2015
STATUS
approved