A005821 - OEIS

This site is supported by donations to The OEIS Foundation.

A005821

a(n) = [ tau*a(n-1) ] + a(n-2).

0, 1, 1, 2, 4, 8, 16, 33, 69, 144, 301, 631, 1321, 2768, 5799, 12150, 25458, 53341, 111765, 234180, 490676, 1028110, 2154192, 4513665, 9457455, 19816148, 41520655, 86997979, 182286341, 381943474 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	MAPLE	`Digits := 20: tau := evalf( (1+sqrt(5))/2): A005821 := proc(n) option remember; if n <= 1 then n; else A005821(n-2)+floor(tau*A005821(n-1)); fi; end;`
	CROSSREFS	`Sequence in context: A121485 A098588 A126683 * A177794 A004149 A129986` `Adjacent sequences: A005818 A005819 A005820 * A005822 A005823 A005824`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 18:22 EST 2012. Contains 205835 sequences.