A106710 - OEIS

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A106710

Number of words with n letters from an alphabet of size 26 with at least two equal consecutive letters.

0, 26, 1326, 50726, 1725126 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n) = 26^n - 26*(25^(n - 1))`
	EXAMPLE	`a(3) = 1326 because 26^3 - 26*(25^2) = 1326`
	CROSSREFS	`Sequence in context: A200721 A187463 A160311 * A114052 A042303 A042300` `Adjacent sequences: A106707 A106708 A106709 * A106711 A106712 A106713`
	KEYWORD	`nonn`
	AUTHOR	`Luca Colucci (lcolucci(AT)caridata.it), May 14 2005`

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Last modified February 17 11:35 EST 2012. Contains 206011 sequences.