%I A005800 M2188
%S A005800 1,2,2248,54103952,9573516562048,7512502267832874752,
%T A005800 19387585646491113265435648,134942950050961684035671842506752,
%U A005800 2199105667698535717737352110310013698048
%N A005800 Generalized Euler numbers of type 3^2n.
%D A005800 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A005800 Gessel, Ira M.; Symmetric functions and P-recursiveness. J. Combin. Theory 
               Ser. A 53 (1990), no. 2, 257-285.
%F A005800 a(n) = 1/36^n * sum_{i=0..2*n} binomial(2*n, i) * A000364(n+i)
%t A005800 a[n_] := Sum[Binomial[2n, i]Abs[EulerE[2(n+i)]], {i, 0, 2n}]/36^n
%Y A005800 Sequence in context: A028487 A073476 A051103 this_sequence A133074 A135234 
               A114067
%Y A005800 Adjacent sequences: A005797 A005798 A005799 this_sequence A005801 A005802 
               A005803
%K A005800 nonn,easy
%O A005800 0,2
%A A005800 N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
%E A005800 Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Dec 10 2002