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A069874 a(1) = a(2) = 1; a(n) = 2^a(n-1) + 2^a(n-2) for n > 2. 0
1, 1, 4, 18, 262160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..5.

MATHEMATICA

a[n_] := 1 /; n == 1 a[n_] := 1 /; n == 2 a[n_] := 2^a[n - 1] + 2^a[n - 2] /; n > 2; Table[a[i], {i, 1, 6}]

CROSSREFS

Sequence in context: A156491 A342467 A287677 * A222323 A012496 A024572

Adjacent sequences:  A069871 A069872 A069873 * A069875 A069876 A069877

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Apr 23 2002

EXTENSIONS

a(6) has 78919 digits.

STATUS

approved

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Last modified January 20 03:25 EST 2022. Contains 350467 sequences. (Running on oeis4.)