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 A191864 a(n) = (a(n-1) + a(n-4)) * (a(n-2) - a(n-3)) with a(1)=1, a(2)=2, a(3)=3 and a(4)=4 0
 1, 2, 3, 4, 5, 7, 10, 28, 99, 1908, 136178, 246396654, 33083692025310, 8147205746460109635768, 269537638338486762080764802762484576, 2195978587041305889551144566841383797948181151148527903340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA a(n) = (a(n-1) + a(n-4)) * (a(n-2) - a(n-3)) with a(1)=1, a(2)=2, a(3)=3 and a(4)=4 a(n) = k^(phi^n + o(1)) with k = 1.06164666362... and phi = (1+sqrt(5))/2. [Charles R Greathouse IV, Jun 21 2011] EXAMPLE a(5) = (4+1)*(3-2) = 5 ; a(6) = (5+2)*(4-3) = 7 PROG (PARI) a=vector(20, i, i); for(n=6, #a, a[n]=(a[n-1]+a[n-4])*(a[n-2]-a[n-3])); a \\ Charles R Greathouse IV, Jun 21 2011 CROSSREFS Sequence in context: A212463 A130080 A057496 * A180348 A001729 A001087 Adjacent sequences:  A191861 A191862 A191863 * A191865 A191866 A191867 KEYWORD nonn,changed AUTHOR Karsten Meyer, Jun 18 2011 STATUS approved

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Last modified May 23 03:06 EDT 2013. Contains 225585 sequences.