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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 (list; graph; refs; listen; history; text; internal format)
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(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}]

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

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Last modified November 15 18:29 EST 2019. Contains 329149 sequences. (Running on oeis4.)