OFFSET
1,1
LINKS
FORMULA
a(n) = 6*7^floor((n-1)/2).
a(n) = 7*a(n-2). G.f.: 6*x*(1+x)/(1-7*x^2). [Colin Barker, Jun 30 2012]
MATHEMATICA
6*7^Floor[Range[0, 40]/2] (* Harvey P. Dale, Mar 23 2012 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Martin Renner, May 02 2006
EXTENSIONS
More terms from Harvey P. Dale, Mar 23 2012
STATUS
approved