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A099941 a(0) = 4; for n>0, a(n) = a(n-1)^2 - 10. 0
4, 6, 26, 666, 443546, 196733054106, 38703894577874323459226, 1497991455495209454913926565546156918884519066, 2243978400736656089037771915607429213031952311714405870405411591378207718779971154117512346 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

A. V. Aho and N. J. A. Sloane, Some doubly exponential sequences, Fib. Quart., 11 (1973), 429-437.

FORMULA

a(n) ~ c^(2^n), where c = 2.25389493024591818564987473260518595497528199646373551430047151255211... . - Vaclav Kotesovec, May 21 2015

MATHEMATICA

RecurrenceTable[{a[n]==a[n-1]^2-10, a[0]==4}, a, {n, 0, 10}] (* Vaclav Kotesovec, May 21 2015 *)

CROSSREFS

Sequence in context: A054094 A123873 A193689 * A074120 A054265 A105409

Adjacent sequences:  A099938 A099939 A099940 * A099942 A099943 A099944

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 12 2004

STATUS

approved

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Last modified December 15 00:30 EST 2019. Contains 329988 sequences. (Running on oeis4.)