id:A046700 - OEIS Search Results

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a(1) = a(2) = a(3) = 1, a(n) = a(n - a(n-1)) + a(n - a(n-3)) for n > 3.

+0
4

1, 1, 1, 2, 3, 4, 4, 5, 5, 7, 6, 8, 7, 9, 8, 10, 9, 12, 9, 12, 10, 15, 11, 16, 12, 17, 13, 18, 14, 19, 15, 21, 17, 18, 18, 21, 19, 21, 24, 20, 22, 24, 20, 31, 19, 30, 19, 28, 19, 30, 21, 32, 21, 34, 21, 36, 21, 38, 21, 48, 18, 53, 15, 49, 18, 49, 24, 61, 17, 51, 19, 42 (list; graph; listen)

	OFFSET	`1,4`
	REFERENCES	`Sequence proposed by Reg Allenby.`
	LINKS	`N. J. A. Sloane, Table of n, a(n) for n = 1..164 [The full sequence]` `B. Balamohan, A. Kuznetsov and S. Tanny, On the behavior of a variant of Hofstadter's Q-sequence, J. Integer Sequences, Vol. 10 (2007), #07.7.1.` `Index entries for Hofstadter-type sequences`
	MAPLE	`V := proc(n) option remember; if n<=3 then 1 else if n > V(n-1) and n > V(n-3) then RETURN(V(n-V(n-1))+V(n-V(n-3))); else ERROR(" died at n= ", n); fi; fi; end;`
	CROSSREFS	`Sequence in context: A071991 A096336 A081609 this_sequence A110532 A049987 A051898` `Adjacent sequences: A046697 A046698 A046699 this_sequence A046701 A046702 A046703`
	KEYWORD	`nonn,fini`
	AUTHOR	`R. K. Guy (rkg(AT)cpsc.ucalgary.ca)`
	EXTENSIONS	`Undefined past a(164), since a(164) = 202.` `Edited by N. J. A. Sloane (njas(AT)research.att.com), Nov 06 2007`

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.

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