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0, 0, 8, 24, 80, 240, 728, 2184, 6560, 19680, 59048, 177144, 531440, 1594320, 4782968, 14348904, 43046720, 129140160, 387420488, 1162261464, 3486784400, 10460353200, 31381059608, 94143178824, 282429536480, 847288609440
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| O.g.f.: 8x^2/((1-3x)(1-x)(1+x)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 09 2008
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MAPLE
| A010684 := proc(n) 1+2*(n mod 2) ; end: A141317 := proc(n) 3^n-A010684(n) ; end: for n from 0 to 50 do printf("%d, ", A141317(n)) ; od: # R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 09 2008
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CROSSREFS
| Sequence in context: A078158 A116486 A179609 * A146534 A180888 A097544
Adjacent sequences: A141314 A141315 A141316 * A141318 A141319 A141320
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Aug 02 2008
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EXTENSIONS
| Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 09 2008
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