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Search: id:A081956
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| 2, 10, 38, 130, 422, 1330, 4118, 12610, 38342, 116050, 350198, 1054690, 3172262, 9533170, 28632278, 85962370, 258018182, 774316690, 2323474358, 6971471650, 20916512102, 62753730610, 188269580438, 564825518530, 1694510110022
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=2*(3^n-2^n) = A056182(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 17 2008]
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MAPLE
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A081954 := proc(n, k) 2^(n-k)*3^k ; end: A081956 := proc(n) add( A081954(n, k), k=0..n-1) ; end: for n from 1 to 30 do printf("%d, ", A081956(n)) ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2007
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CROSSREFS
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Cf. A025192, A081954, A081955.
Adjacent sequences: A081953 A081954 A081955 this_sequence A081957 A081958 A081959
Sequence in context: A119358 A110148 A056182 this_sequence A120278 A143960 A122117
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KEYWORD
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nonn,new
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 02 2003
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2007
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