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 A005800 Generalized Euler numbers of type 3^2n. (Formerly M2188) 0
 1, 2, 2248, 54103952, 9573516562048, 7512502267832874752, 19387585646491113265435648, 134942950050961684035671842506752, 2199105667698535717737352110310013698048 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Ira M. Gessel, Symmetric functions and P-recursiveness, J. Combin. Theory Ser. A 53 (1990), no. 2, 257-285. FORMULA a(n) = (1/36^n) * Sum_{i=0..2*n} binomial(2*n, i) * A000364(n+i). MATHEMATICA a[n_] := Sum[Binomial[2n, i]Abs[EulerE[2(n+i)]], {i, 0, 2n}]/36^n CROSSREFS CF. A000364 (Euler numbers). Sequence in context: A028487 A073476 A051103 * A200170 A280899 A288164 Adjacent sequences:  A005797 A005798 A005799 * A005801 A005802 A005803 KEYWORD nonn,easy AUTHOR EXTENSIONS Edited by Dean Hickerson, Dec 10 2002 STATUS approved

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Last modified October 14 15:03 EDT 2019. Contains 328019 sequences. (Running on oeis4.)