OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (26,-231,766,-560).
FORMULA
a(n) = (7*10^(n+3) - 27*8^(n+3) + 21*7^(n+3) - 1)/378. [Yahia Kahloune, Jun 28 2013]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved