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Search: id:A001881
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| A001881 |
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Coefficients of Bessel polynomials y_n (x).
(Formerly M5116 N2217)
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+0
5
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| 1, 21, 378, 6930, 135135, 2837835, 64324260, 1571349780, 41247931725, 1159525191825, 34785755754750, 1109981842719750, 37554385678684875, 1343291487737574375
(list; graph; listen)
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OFFSET
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5,2
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REFERENCES
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J. Riordan, Combinatorial Identities, Wiley, 1968, p. 77.
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LINKS
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Index entries for sequences related to Bessel functions or polynomials
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FORMULA
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(2n-5)!/ [5!*(n-5)!*2^(n-5) ].
a(n)= binomial(n-3,2)*(2*n-5)!!/5!!, n>=5, with (2*n-5)!! = A001147(n-2).
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CROSSREFS
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See A001518.
(1/4) the coefficient of x^2 of polynomials in A098503.
Column 5 of triangle A001497.
Third column (m=2) of Laguerre-Sonin a=1/2 triangle A130757.
Sequence in context: A036904 A134494 A004370 this_sequence A108740 A094172 A015677
Adjacent sequences: A001878 A001879 A001880 this_sequence A001882 A001883 A001884
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KEYWORD
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nonn,easy
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AUTHOR
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njas, Simon Plouffe (plouffe(AT)math.uqam.ca)
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