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 A175985 a(1) = 1, for n >= 2: a(n) = (a(n-1)+1)^(n-1) - 1. 1
 1, 1, 3, 63, 16777215, 1329227995784915872903807060280344575 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS The next term (a(7)) has 217 digits. LINKS FORMULA a(n+1) = 2^A000142(n) - 1; A000142 = factorial numbers. EXAMPLE For n = 4: a(4) = (3+1)^3 - 1 = 63. PROG (PARI) a(n)=if(n<=1, 1, (a(n-1)+1)^(n-1)-1); /* Joerg Arndt, Jun 10 2011 */ CROSSREFS Sequence in context: A156904 A193100 A053857 * A037108 A249097 A092901 Adjacent sequences:  A175982 A175983 A175984 * A175986 A175987 A175988 KEYWORD nonn,easy AUTHOR Jaroslav Krizek, Nov 03 2010 STATUS approved

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Last modified August 13 20:49 EDT 2022. Contains 356107 sequences. (Running on oeis4.)