Lacunary ogf of Laguerre's

[Karol PENSON]

   Dear Seqfans,
Does anyone know a closed form expression for the double-lacunary, 
ordinary generating function
of Laguerre polynomials, i.e. , in Maple notation, for

                                  sum(t^n*LaguerreL(2*n,x), 
n=0..infinity) ?                    

 Thanks ,      Karol A. Penson

-- 
_________________________________________________________________________
Karol A. PENSON
Universite Paris 6              |  Internet : penson at lptl.jussieu.fr.
Lab. Physique Theorique des     |
Liquides                        | http://www.lptl.jussieu.fr/users/penson
Boite courrier 121              |
4, place Jussieu, Tour 24, Et.4 |      Tel : (33 1) 44 27 72 33
75252 Paris Cedex 05, France    |      Fax : (33 1) 44 27 51 00       

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