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A081956
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Sum of n-th row in A081954.
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3
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| 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
| 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
| Cf. A025192, A081954, A081955.
Sequence in context: A119358 A110148 A056182 * A120278 A166898 A143960
Adjacent sequences: A081953 A081954 A081955 * A081957 A081958 A081959
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 02 2003
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2007
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