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A001880 Coefficients of Bessel polynomials y_n (x).
(Formerly M4989 N2146)
+0
5
1, 15, 210, 3150, 51975, 945945, 18918900, 413513100, 9820936125, 252070693875, 6957151150950, 205552193096250, 6474894082531875, 216659917377028125 (list; graph; listen)
OFFSET

4,2

REFERENCES

J. Riordan, Combinatorial Identities, Wiley, 1968, p. 77.

LINKS

Index entries for sequences related to Bessel functions or polynomials

FORMULA

E.g.f.: x(1 + x/2)/(1 - 2x)^{7/2}; or, if shifted, (1+ 6x+ 3x^2/2!) / (1-2x)^(9/2).

(2n-4)!/ [4!*(n-4)!*2^(n-4) ].

CROSSREFS

See A001518.

Column 4 of triangle A001497.

Sequence in context: A112496 A000483 A076139 this_sequence A113362 A135519 A051826

Adjacent sequences: A001877 A001878 A001879 this_sequence A001881 A001882 A001883

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.


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