OFFSET
1,2
LINKS
FORMULA
a(n) = 2*a(n-1) + 9, a(1)= -1. - Vincenzo Librandi, Mar 20 2011
For n >= 3, a(n) = 8<+>(n+2), where operation <+> is defined in A206853. - Vladimir Shevelev, Feb 17 2012
MATHEMATICA
Table[4 2^n - 9, {n, 1, 100}]
LinearRecurrence[{3, -2}, {-1, 7}, 30] (* Harvey P. Dale, May 27 2021 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Artur Jasinski, Jan 29 2010
STATUS
approved