id:A127195 - OEIS Search Results

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Number of subsets of {1,2,...,n} which contain no three consecutive odd numbers.

+0
1

2, 4, 8, 16, 28, 56, 104, 208, 384, 768, 1408, 2816, 5184, 10368, 19072, 38144, 70144, 140288, 258048, 516096, 949248, 1898496, 3491840, 6983680, 12845056, 25690112, 47251456, 94502912, 173817856, 347635712, 639401984, 1278803968 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n) = A000073(floor((n+1)/2)-3) * 2^(floor(n/2))`
	CROSSREFS	`Sequence in context: A089055 A112128 A054189 this_sequence A018726 A049884 A085583` `Adjacent sequences: A127192 A127193 A127194 this_sequence A127196 A127197 A127198`
	KEYWORD	`easy,nonn`
	AUTHOR	`Fung Cheok Yin (cheokyin_restart(AT)yahoo.com.hk), Mar 27 2007`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research