id:A025237 - OEIS Search Results

Search: id:A025237

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a(n) = (1/3)*s(n+2), where s = A014432.

+0
2

1, 4, 10, 37, 121, 451, 1639, 6259, 23923, 93502, 367852, 1465003, 5874103, 23740276, 96503554, 394542379, 1620716251, 6687296308, 27700303510, 115152607831, 480244735171, 2008802728819, 8425318166635, 35425680021397, 149296062114181 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`G.f.: (1-x-6x^2-sqrt(1-2x-11x^2))/(6x^2) - Michael Somos, Jun 08 2000`
	PROGRAM	`(PARI) a(n)=polcoeff((1-x-6x^2-sqrt(1-2x-11x^2+x^3O(x^n)))/6, n+2) (from Michael Somos)`
	CROSSREFS	`Sequence in context: A088013 A052572 A079725 this_sequence A102755 A046562 A032123` `Adjacent sequences: A025234 A025235 A025236 this_sequence A025238 A025239 A025240`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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