OFFSET
0,1
FORMULA
a(n)=7*a(n-1)-12*a(n-2) = 4*3^n+4^n. G.f.: (5-19x)/((1-4x)(1-3x)). [From R. J. Mathar, Nov 09 2008]
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Roger L. Bagula, Nov 06 2008
EXTENSIONS
Meaningful name from Joerg Arndt, Dec 26 2022
STATUS
approved