A080763 - OEIS

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A080763

Exchange 1's and 2's in the eta-sequence A006337.

2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	FORMULA	`Digits := 100: c2 := sqrt(2.): A080763 := n->3-floor((n+1)c2)+floor(nc2);`
	MATHEMATICA	`Flatten[ Table[ Nest[ Flatten[ # /. {1 -> {2, 2, 1}, 2 -> {2, 1}}] &, {2}, n], {n, 5}]] (from Robert G. Wilson v (rgwv(AT)rgwv.com), May 06 2005)`
	CROSSREFS	`Different from A022921.` `Sequence in context: A195969 A023518 A022921 * A165413 A172155 A080573` `Adjacent sequences: A080760 A080761 A080762 * A080764 A080765 A080766`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Mar 25 2003`

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Last modified February 15 13:16 EST 2012. Contains 205795 sequences.