id:A089889 - OEIS Search Results

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Number of subsets of {1,.., n} containing exactly one square.

+0
4

1, 2, 4, 8, 16, 32, 64, 128, 192, 384, 768, 1536, 3072, 6144, 12288, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 5242880, 10485760, 20971520, 41943040, 83886080, 167772160, 335544320, 671088640, 1342177280 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)=A000196(n)*A089887(n);` `for n>1: a(n) = A089886(n,1).`
	FORMULA	`a(n) = n^(1/2) * 2^(n-n^(1/2)).`
	CROSSREFS	`Cf. A089890.` `Sequence in context: A036146 A036144 A009641 this_sequence A054045 A008860 A145114` `Adjacent sequences: A089886 A089887 A089888 this_sequence A089890 A089891 A089892`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 13 2003`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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