A099941 a(0) = 4; for n>0, a(n) = a(n-1)^2 - 10.

4, 6, 26, 666, 443546, 196733054106, 38703894577874323459226, 1497991455495209454913926565546156918884519066, 2243978400736656089037771915607429213031952311714405870405411591378207718779971154117512346

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, Fibonacci Quarterly, Vol. 11, No. 4 (1973), pp. 429-437.

A. V. Aho and N. J. A. Sloane, Some doubly exponential sequences, Fibonacci Quarterly, Vol. 11, No. 4 (1973), pp. 429-437 (original plus references that F.Q. forgot to include - see last page!)

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