id:A078707 - OEIS Search Results

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Number of vectors of length n that are symmetric about the middle, where each element is drawn from a set of n distinct elements.

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1, 2, 9, 16, 125, 216, 2401, 4096, 59049, 100000, 1771561, 2985984, 62748517, 105413504, 2562890625, 4294967296, 118587876497, 198359290368, 6131066257801, 10240000000000, 350277500542221, 584318301411328 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = n^(floor([(n+1)/2]))`
	PROGRAM	`(PARI) for(n=1, 22, print1(n^((n+n%2)/2), ", "))`
	CROSSREFS	`Cf. A004526.` `Sequence in context: A032136 A032040 A045661 this_sequence A085332 A062981 A069622` `Adjacent sequences: A078704 A078705 A078706 this_sequence A078708 A078709 A078710`
	KEYWORD	`nonn`
	AUTHOR	`Mark Sterling (half_trac(AT)hotmail.com), Dec 18 2002`
	EXTENSIONS	`Extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 19 2002`

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Last modified November 22 20:51 EST 2009. Contains 167312 sequences.

AT&T Labs Research