id:A000458 - OEIS Search Results

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a(0) = a(1) = 1; thereafter a(n) = sigma(a(n-1)) + sigma(a(n-2)).

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1, 1, 2, 4, 10, 25, 49, 88, 237, 500, 1412, 3570, 12846, 36072, 126504, 493920, 2358720, 12292224, 49984224, 171237888, 642804078, 1980490350, 6380883000, 27032104440, 117961599600, 555861355920, 2623445776224 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`T. D. Noe, Table of n, a(n) for n=0..100`
	MAPLE	`A000458 := proc(n) options remember; if n <= 1 then RETURN(1) else sigma(A000458(n-1))+sigma(A000458(n-2)); fi; end;`
	CROSSREFS	`Sequence in context: A148090 A148091 A123420 this_sequence A089928 A036887 A151536` `Adjacent sequences: A000455 A000456 A000457 this_sequence A000459 A000460 A000461`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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