OFFSET
0,2
LINKS
FORMULA
a(0) = 1, a(n) = 9*13^(n-1) for n>0.
a(n) = Sum_{k=0..n} A193722(n,k)*4^k.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Oct 05 2011
STATUS
approved