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A073525 Result of applying the transformation on generating functions A -> 1/((1-x)*(1-x*A)) to the g.f. for A024718. 2
1, 2, 5, 15, 51, 187, 716, 2811, 11204, 45089, 182636, 743180, 3034361, 12420945, 50946169, 209296302, 860941813, 3545265139, 14611979639, 60268977054, 248744871983, 1027188978686, 4243751316106, 17539851091965, 72519657462805, 299930389183429, 1240806275485094 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Equivalently, result of applying same transformation 4 times to g.f. for Catalan numbers A000108.

LINKS

Table of n, a(n) for n=0..26.

FORMULA

G.f.: -(4*t-1+(-4*t+1)^(1/2))/(6*t^2-5*t+(-4*t+1)^(1/2)*t+1-(-4*t+1)^(1/2)).

CROSSREFS

Cf. A000108, A014137, A024718.

Sequence in context: A149955 A007581 A124303 * A007317 A181768 A279554

Adjacent sequences:  A073522 A073523 A073524 * A073526 A073527 A073528

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2002

STATUS

approved

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Last modified February 18 02:57 EST 2020. Contains 332006 sequences. (Running on oeis4.)