login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A160067 Numerator of Hermite(n, 23/25). 1

%I #15 Sep 08 2022 08:45:44

%S 1,46,866,-75164,-6705044,67387976,45006371896,1564883287216,

%T -321821122878064,-30452604524550944,2219667824248876576,

%U 482762276472335122496,-8313367865694637285184,-7623849068906980152558464,-215604829352183231133449344

%N Numerator of Hermite(n, 23/25).

%H G. C. Greubel, <a href="/A160067/b160067.txt">Table of n, a(n) for n = 0..380</a>

%F From _G. C. Greubel_, Sep 23 2018: (Start)

%F a(n) = 25^n * Hermite(n, 23/25).

%F E.g.f.: exp(46*x - 625*x^2).

%F a(n) = numerator(Sum_{k=0..floor(n/2)} (-1)^k*n!*(46/25)^(n-2*k)/(k!*(n-2*k)!)). (End)

%e Numerators of 1, 46/25, 866/625, -75164/15625, -6705044/390625, ...

%t Table[25^n*HermiteH[n, 23/25], {n, 0, 30}] (* _G. C. Greubel_, Sep 23 2018 *)

%o (PARI) a(n)=numerator(polhermite(n, 23/25)) \\ _Charles R Greathouse IV_, Jan 29 2016

%o (PARI) x='x+O('x^30); Vec(serlaplace(exp(46*x - 625*x^2))) \\ _G. C. Greubel_, Sep 23 2018

%o (Magma) [Numerator((&+[(-1)^k*Factorial(n)*(46/25)^(n-2*k)/( Factorial(k) *Factorial(n-2*k)): k in [0..Floor(n/2)]])): n in [0..30]]; // _G. C. Greubel_, Sep 23 2018

%Y Cf. A009969 (denominators).

%K sign,frac

%O 0,2

%A _N. J. A. Sloane_, Nov 12 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 16 13:54 EDT 2024. Contains 371730 sequences. (Running on oeis4.)