A069874 - OEIS

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A069874

a(1) = a(2) = 1; a(n) = 2^a(n-1) + 2^a(n-2) for n > 2.

1, 1, 4, 18, 262160 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	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: A114574 A173222 A156491 * A012496 A024572 A009267` `Adjacent sequences: A069871 A069872 A069873 * A069875 A069876 A069877`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Apr 23 2002`
	EXTENSIONS	`a(6) has 78919 digits.`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.