id:A084215 - OEIS Search Results

Search: id:A084215

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G.f.: (1+x^2)/(1-2x).

+0
2

1, 2, 5, 10, 20, 40, 80, 160, 320, 640, 1280, 2560, 5120, 10240, 20480, 40960, 81920, 163840, 327680, 655360, 1310720, 2621440, 5242880, 10485760, 20971520, 41943040, 83886080, 167772160, 335544320, 671088640, 1342177280, 2684354560 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Associated with a math magic problem.` `Elements are the sums of consecutive pairs of elements of A084214.`
	FORMULA	`a(n)=sum{k=0..n, 2^(n-k)binomial(1, k/2)(1+(-1)^k)/2} - Paul Barry (pbarry(AT)wit.ie), Oct 15 2004`
	CROSSREFS	`Cf. A060816.` `Adjacent sequences: A084212 A084213 A084214 this_sequence A084216 A084217 A084218` `Sequence in context: A102688 A001629 A068034 this_sequence A024810 A049938 A002460`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 19 2003`

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Last modified May 11 10:28 EDT 2008. Contains 139662 sequences.

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