

A172252


a(n) = 4*2^n  9.


1



1, 7, 23, 55, 119, 247, 503, 1015, 2039, 4087, 8183, 16375, 32759, 65527, 131063, 262135, 524279, 1048567, 2097143, 4194295, 8388599, 16777207, 33554423, 67108855, 134217719, 268435447, 536870903, 1073741815, 2147483639
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..29.
Index entries for linear recurrences with constant coefficients, signature (3,2).


FORMULA

a(n) = 2*a(n1) + 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}]


CROSSREFS

Sequence in context: A004068 A261893 A022815 * A027116 A151718 A027918
Adjacent sequences: A172249 A172250 A172251 * A172253 A172254 A172255


KEYWORD

sign,easy


AUTHOR

Artur Jasinski, Jan 29 2010


STATUS

approved



