A049171 - OEIS

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A049171

Revert transform of 2*(1 + x + x^2)-1/(1-x).

1, 1, 3, 9, 33, 125, 503, 2081, 8849, 38345, 168875, 753401, 3398177, 15469493, 70984559, 327982529, 1524644897, 7125440913, 33459931155, 157794990633, 747021246817, 3548843286829, 16912921740775, 80836929471329 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`Sign diagram of generating sequence: +++-------------...`
	LINKS	`Index entries for reversions of series`
	FORMULA	`a(n+1)= Sum_{k, 0<=k<=floor(n/2)} A108759(n,k)*2^k. [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 08 2009]`
	CROSSREFS	`Sequence in context: A039648 A049182 A049168 * A050387 A049157 A138178` `Adjacent sequences: A049168 A049169 A049170 * A049172 A049173 A049174`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified February 15 10:06 EST 2012. Contains 205763 sequences.