OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (21, -158, 504, -576).
FORMULA
a(n)=(3*8^(n+3)-10*6^(n+3)+15*4^(n+3)-8*3^(n+3))/120. [Yahia Kahloune, May 27 2013].
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved