A056451 - OEIS

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A056451

Number of palindromes using a maximum of five different symbols.

5, 5, 25, 25, 125, 125, 625, 625, 3125, 3125, 15625, 15625, 78125, 78125, 390625, 390625, 1953125, 1953125, 9765625, 9765625, 48828125, 48828125, 244140625, 244140625, 1220703125, 1220703125, 6103515625 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 1..2000`
	FORMULA	`a(n) = 5^floor((n+1)/2).`
	PROG	`(MAGMA) [5^Floor((n+1)/2): n in [1..40]]; // Vincenzo Librandi, Aug 16 2011`
	CROSSREFS	`Cf. A016116.` `Sequence in context: A145764 A165826 A071340 * A074872 A162962 A170834` `Adjacent sequences: A056448 A056449 A056450 * A056452 A056453 A056454`
	KEYWORD	`nonn,easy`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified February 17 18:57 EST 2012. Contains 206074 sequences.