A050190 - OEIS

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A050190

T(n,5), array T as in A050186; a count of aperiodic binary words.

0, 6, 21, 56, 126, 250, 462, 792, 1287, 2002, 3000, 4368, 6188, 8568, 11628, 15500, 20349, 26334, 33649, 42504, 53125, 65780, 80730, 98280, 118755, 142500, 169911, 201376, 237336, 278256, 324625, 376992, 435897, 501942 (list; graph; refs; listen; history; internal format)

	OFFSET	`5,2`
	FORMULA	`G.f.: x^6(x^9-x^5-4x^4-15x^3+20x^2-15x+6)/[(1-x)^6(1-x^5)^2]. a(n) = A000389(n) - [5 divides n]n/5 = nfloor(C(n-1, 4)/5). - R. Stephan, Aug 18 2004`
	CROSSREFS	`Equals nA051170(n).` `Sequence in context: A002817 A132366 A015641 A008498 A015640 A138780` `Adjacent sequences: A050187 A050188 A050189 * A050191 A050192 A050193`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`
	EXTENSIONS	`More terms from R. Stephan, Aug 18 2004`

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Last modified February 13 22:36 EST 2012. Contains 205567 sequences.