id:A037488 - OEIS Search Results

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Base 3 digits are, in order, the first n terms of the periodic sequence with initial period 2,1.

+0
1

2, 7, 23, 70, 212, 637, 1913, 5740, 17222, 51667, 155003, 465010, 1395032, 4185097, 12555293, 37665880, 112997642, 338992927, 1016978783, 3050936350, 9152809052, 27458427157, 82375281473, 247125844420, 741377533262 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`G.f.: x(2+x)/((1-x^2)(1-3*x)). - Michael Somos, Sep 28, 2002`
	PROGRAM	`(PARI) a(n)=if(n<1, 0, 3a(n-1)+1+n%2)` `a(n)=if(n<1, 0, 3^n7\8)`
	CROSSREFS	`Sequence in context: A034546 A010748 A048496 this_sequence A129669 A037568 A076656` `Adjacent sequences: A037485 A037486 A037487 this_sequence A037489 A037490 A037491`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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

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