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A090004 Expansion of L(x)^1/2, where L(x) is the g.f. for the Catalan Larcombe-French sequence A053175. 4
1, 4, 32, 320, 3616, 44160, 568320, 7587840, 104042496, 1455308800, 20671234048, 297204973568, 4315444576256, 63173752913920, 931171553771520, 13806071300751360, 205737584679321600, 3079516590086553600, 46275305227975393280, 697790255614687969280, 10554814464110079508480 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..833

FORMULA

a(n) = 2^n * A089603(n). - Seiichi Manyama, Jan 13 2019

PROG

(PARI) Vec( 1/agm(1, 1-16*x+O(x^66))^(1/2) ) \\ Joerg Arndt, Aug 14 2013

CROSSREFS

Cf. A053175, A089602, A089603.

Sequence in context: A052704 A151403 A289427 * A061631 A291342 A099912

Adjacent sequences:  A090001 A090002 A090003 * A090005 A090006 A090007

KEYWORD

nonn,easy

AUTHOR

Peter J Larcombe, Jan 19 2004

EXTENSIONS

More terms from Christian G. Bower, Jan 19 2004

STATUS

approved

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Last modified June 19 11:14 EDT 2019. Contains 324219 sequences. (Running on oeis4.)