id:A025249 - OEIS Search Results

Search: id:A025249

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(1/2)*s(n+3), where s = A025248.

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1, 1, 3, 7, 13, 29, 71, 163, 377, 913, 2219, 5375, 13189, 32677, 81167, 202523, 508273, 1280537, 3236275, 8207543, 20880893, 53263405, 136205527, 349137811, 896881641, 2308523809, 5953138875, 15378562415, 39791453685, 103115768885, 267597960095 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`G.f.: (1-x-4x^3-sqrt(1-2x+x^2-8x^3))/(4x^3) - Michael Somos, Jun 08, 2000.`
	PROGRAM	`(PARI) a(n)=polcoeff((-sqrt(1-2x+x^2-8x^3+x^4*O(x^n)))/4, n+3)`
	CROSSREFS	`Sequence in context: A161490 A134270 A091565 this_sequence A147098 A109291 A062700` `Adjacent sequences: A025246 A025247 A025248 this_sequence A025250 A025251 A025252`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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