A160473 - OEIS

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A160473

The p(n) sequence that is associated with the Eta triangle A160464

3, 30, 315, 11340, 311850, 12162150, 638512875, 86837751000, 7424627710500, 779585909602500, 98617617564716250, 14792642634707437500, 2596108782391155281250, 527010082825404522093750 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,1`
	FORMULA	`a(n) = 2^(-(2(n-1)-1-floor(ln(n-1)/ln(2))))(2*n-1)! for n = 2, 3, 4, .. .`
	CROSSREFS	`A160464 is the Eta triangle.` `Equals 3(n-2)!A000457(n-2)/A054243(n-1)` `Equals 2^(-A049039(n-1))(2n-1)!` `Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Jul 06 2009: (Start)` `Cf. The pg(n) sequence A162440.` `(End)` `Sequence in context: A131586 A163475 A200142 * A144283 A178016 A058831` `Adjacent sequences: A160470 A160471 A160472 * A160474 A160475 A160476`
	KEYWORD	`easy,nonn`
	AUTHOR	`Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 2009`

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.