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 A144744 Recurrence sequence a(n)=a(n-1)^2-a(n-1)-1, a(0)=4. 5
 4, 11, 109, 11771, 138544669, 19194625169774891, 368433635408155743950638444286989, 135743343700069833946317076518699443524748244656296738254150399131 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS a(0)=3 is the smallest integer generating an increasing sequence of the form a(n)=a(n-1)^2-a(n-1)-1. LINKS FORMULA a(n)=a(n-1)^2-a(n-1)-1 and a(0)=4. a(n) ~ c^(2^n), where c = 3.22737450272053234771396610986262048906046050824600724014923334412606964... . - Vaclav Kotesovec, May 06 2015 MATHEMATICA a = {}; k = 4; Do[k = k^2 - k - 1; AppendTo[a, k], {n, 1, 10}]; a PROG (PARI) a(n, s=4)={for(i=1, n, s=s^2-s-1); s} \\ M. F. Hasler, Oct 06 2014 CROSSREFS Cf. A000058, A082732, A144743, A144745, A144746, A144747, A144748. Sequence in context: A125888 A266894 A296617 * A267154 A320501 A214113 Adjacent sequences:  A144741 A144742 A144743 * A144745 A144746 A144747 KEYWORD nonn AUTHOR Artur Jasinski, Sep 20 2008 EXTENSIONS Edited by M. F. Hasler, Oct 06 2014 STATUS approved

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Last modified August 14 18:13 EDT 2022. Contains 356122 sequences. (Running on oeis4.)