A159039 - OEIS

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A159039

Expansion of sec(x)/(1-x).

1, 1, 3, 9, 41, 205, 1291, 9037, 73681, 663129, 6681811, 73499921, 884701817, 11501123621, 161215091675, 2418226375125, 38711013514145, 658087229740465, 11847975015003811, 225111525285072409, 4502600876889685705 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	FORMULA	`G.f.:sec(x)/(1-x)`
	MAPLE	`restart: G(x):=sec(x)/(1-x): f[0]:=G(x): for n from 1 to 21 do f[n]:=diff(f[n-1], x) od: x:=0: seq(f[n], n=0..21); #`
	CROSSREFS	`Sequence in context: A018417 A012246 A012099 * A074502 A109743 A139150` `Adjacent sequences: A159036 A159037 A159038 * A159040 A159041 A159042`
	KEYWORD	`nonn`
	AUTHOR	`Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 03 2009`

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Last modified February 13 17:43 EST 2012. Contains 205523 sequences.