id:A025245 - OEIS Search Results

Search: id:A025245

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(1/2)*s(n+3), where s = A025244.

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1, 2, 5, 11, 26, 65, 163, 416, 1081, 2837, 7516, 20089, 54077, 146478, 398997, 1092215, 3003014, 8289569, 22964919, 63828252, 177931665, 497367721, 1393768952, 3914793457, 11019379609, 31079140922, 87818240869, 248571086403, 704722488690 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`G.f.: (1-x-x^2-4x^3-sqrt(1-2x-x^2-6x^3+x^4))/(4x^3) - Michael Somos, Jun 08, 2000.`
	PROGRAM	`(PARI) a(n)=polcoeff((-sqrt(1-2x-x^2-6x^3+x^4+x^4*O(x^n)))/4, n+3)`
	CROSSREFS	`Adjacent sequences: A025242 A025243 A025244 this_sequence A025246 A025247 A025248` `Sequence in context: A095981 A082397 A051286 this_sequence A079223 A095892 A000664`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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