Search: id:A001880
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%I A001880 M4989 N2146
%S A001880 1,15,210,3150,51975,945945,18918900,413513100,9820936125,252070693875,
%T A001880 6957151150950,205552193096250,6474894082531875,216659917377028125
%N A001880 Coefficients of Bessel polynomials y_n (x).
%D A001880 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001880 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001880 J. Riordan, Combinatorial Identities, Wiley, 1968, p. 77.
%H A001880 <a href="Sindx_Be.html#Bessel">Index entries for sequences related to 
               Bessel functions or polynomials</a>
%F A001880 E.g.f.: x(1 + x/2)/(1 - 2x)^{7/2}; or, if shifted, (1+ 6x+ 3x^2/2!) / 
               (1-2x)^(9/2).
%F A001880 (2n-4)!/ [4!*(n-4)!*2^(n-4) ].
%F A001880 Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 
               2009: (Start)
%F A001880 a(n) = (2*n^2-9*n+10)*a(n-1)/(n-4) for n = 5, 6, .. , with a(4) = 1.
%F A001880 (End)
%Y A001880 See A001518.
%Y A001880 Column 4 of triangle A001497.
%Y A001880 Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 
               2009: (Start)
%Y A001880 Equals the second right hand column of the triangles A094665 and A083061. 
               Other right hand columns are A001147, A160470, A160471 and A160472.
%Y A001880 (End)
%Y A001880 Sequence in context: A112496 A000483 A076139 this_sequence A113362 A135519 
               A051826
%Y A001880 Adjacent sequences: A001877 A001878 A001879 this_sequence A001881 A001882 
               A001883
%K A001880 nonn,easy
%O A001880 4,2
%A A001880 N. J. A. Sloane (njas(AT)research.att.com).

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