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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}] LinearRecurrence[{3, -2}, {-1, 7}, 30] (* Harvey P. Dale, May 27 2021 *) 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 June 2 00:00 EDT 2023. Contains 363078 sequences. (Running on oeis4.)