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A104522
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Expansion of (-1+x+3*x^2-x^3)/((x+1)(3*x-1)(x-1)^2).
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0
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1, 3, 7, 19, 53, 155, 459, 1371, 4105, 12307, 36911, 110723, 332157, 996459, 2989363, 8968075, 26904209, 80712611, 242137815, 726413427, 2179240261, 6537720763, 19613162267, 58839486779, 176518460313, 529555380915, 1588666142719
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| A floretion-generated sequence relating to A081250 (Numbers n such that A081249(m)/m^2 has a local minimum for m = n).
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FORMULA
| a(n) = (1/8) * [5*3^n + 4(n+1) - (-1)^n ]. -- Ralf Stephan, Nov 13 2010.
a(n+2) - 2a(n+1) + a(n) = A081250(n+1) - A081250(n).
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PROG
| Floretion Algebra Multiplication Program, FAMP Code: 1famforrokseq[ - .5'j + .5'k - .5j' + .5k' - 'ii' - .5'ij' - .5'ik' - .5'ji' - .5'ki'], see link "Sequences in Context" for details on "roktype".
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CROSSREFS
| Cf. A081250, A105792.
Sequence in context: A183124 A078481 A183122 * A175533 A115760 A183115
Adjacent sequences: A104519 A104520 A104521 * A104523 A104524 A104525
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KEYWORD
| nonn
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AUTHOR
| Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Apr 20 2005
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