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 A048490 a(n)=T(7,n), array T given by A048483. 2
 1, 9, 25, 57, 121, 249, 505, 1017, 2041, 4089, 8185, 16377, 32761, 65529, 131065, 262137, 524281, 1048569, 2097145, 4194297, 8388601, 16777209, 33554425, 67108857, 134217721, 268435449, 536870905, 1073741817, 2147483641 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA 8 * 2^n - 7. - Ralf Stephan Equals binomial transform of [1, 8, 8, 8,...]. - Gary W. Adamson, Apr 29 2008 a(n) = A000079(n)*8 - 7. [From Omar E. Pol, Dec 21 2008] a(n)=2*a(n-1)+7 (with a(0)=1) [From Vincenzo Librandi, Aug 06 2010] For n>=1, a(n)=6<+>(n+3), where the operation <+> is defined in A206853.-Vladimir Shevelev , Feb 17 2012. EXAMPLE For n=1, a(1)=2*1+7=9; n=2, a(2)=2*9+7=25; n=3, a(3)=2*25+7=57 [From Vincenzo Librandi, Aug 06 2010] MATHEMATICA a=1; lst={a}; k=8; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst [From Vladimir Joseph Stephan Orlovsky, Dec 16 2008] CROSSREFS n-th difference of a(n), a(n-1), ..., a(0) is (8, 8, 8, ...). Cf. A000079. [From Omar E. Pol, Dec 21 2008] Sequence in context: A225322 A031162 A147160 * A113828 A099971 A124702 Adjacent sequences:  A048487 A048488 A048489 * A048491 A048492 A048493 KEYWORD nonn AUTHOR STATUS approved

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Last modified May 24 20:01 EDT 2013. Contains 225630 sequences.