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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A140429 a(n) = floor(3^(n-1)). 7 0, 1, 3, 9, 27, 81, 243, 729, 2187, 6561, 19683, 59049, 177147, 531441, 1594323, 4782969, 14348907, 43046721, 129140163, 387420489, 1162261467, 3486784401, 10460353203, 31381059609, 94143178827, 282429536481, 847288609443 (list; graph; refs; listen; history; text; internal format) OFFSET 0,3 COMMENTS Binomial transform of Jacobsthal numbers A001045. Implicit use in A094555 (Barry). LINKS Table of n, a(n) for n=0..26. Index entries for linear recurrences with constant coefficients, signature (3). FORMULA a(n) = floor(3^(n-1)) = A000244(n-1) = A133494(n), n >= 1. O.g.f.: x/(1-3x). - R. J. Mathar, Aug 27 2008 PROG (PARI) a(n)=if(n<2, n, 3^(n-1)) \\ Charles R Greathouse IV, Oct 03 2016 (PARI) a(n)=floor(3^(n-1)) \\ M. F. Hasler, Apr 13 2018 CROSSREFS Cf. A000079, A131577, A133494. Sequence in context: A216097 A243845 A354269 * A141413 A000244 A133494 Adjacent sequences: A140426 A140427 A140428 * A140430 A140431 A140432 KEYWORD nonn,easy AUTHOR Paul Curtz, Jun 19 2008 EXTENSIONS Extended by R. J. Mathar, Aug 28 2008 New name by M. F. Hasler, Apr 13 2018 STATUS approved

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Last modified August 18 08:16 EDT 2024. Contains 375255 sequences. (Running on oeis4.)