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A001510 From a slowly converging series.
(Formerly M1301 N0499)
0
1, 2, 4, 24, 1104, 2435424, 11862575248704, 281441383062305809756861824, 158418504200047111075388369241884118003210485743490304 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

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.

H. E. Salzer, The approximation of numbers as sums of reciprocals, Amer. Math. Monthly, 54 (1947), 135-142.

Index entries for sequences of form a(n+1)=a(n)^2 + ...

FORMULA

Apparently a(n+2) = A002715(2*n) + 1. - R. J. Mathar, Apr 23 2007

MATHEMATICA

(* a5 = A002715 *) a5[n_?OddQ] := a5[n] = 2*a5[n-1] + 1; a5[n_?EvenQ] := a5[n] = (a5[n-1]^2 - 3)/2; a5[0] = 3; a[n_] := a5[2*n - 4] + 1; a[0] = 1; a[1] = 2; Table[a[n], {n, 0, 8}] (* Jean-Fran├žois Alcover, Jan 25 2013, after R. J. Mathar *)

CROSSREFS

Sequence in context: A296787 A128299 A143672 * A103099 A266495 A119029

Adjacent sequences:  A001507 A001508 A001509 * A001511 A001512 A001513

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified December 14 15:07 EST 2019. Contains 329979 sequences. (Running on oeis4.)