login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A065944 Bessel polynomial {y_n}''(-1). 2
0, 0, 6, -60, 720, -9870, 153510, -2679264, 51934680, -1107917910, 25807660560, -651977992380, 17758547202396, -518856566089680, 16188283372489410, -537210169663283760, 18894951642157260480, -702160022681408982114 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

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

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..400

Index entries for sequences related to Bessel functions or polynomials

FORMULA

Recurrence: (n-2)*(n-1)*a(n) = -(n-2)*(n+1)*(2*n-1)*a(n-1) + n*(n+1)*a(n-2). - Vaclav Kotesovec, Jul 22 2015

a(n) ~ (-1)^n * 2^(n+1/2) * n^(n+2) / exp(n+1). - Vaclav Kotesovec, Jul 22 2015

From G. C. Greubel, Aug 14 2017: (Start)

a(n) = 2*n*(n-1)*(1/2)_{n}*(-2)^(n - 1)* hypergeometric1f1(2 - n, -2*n, -2), where (a)_{n} is the Pochhammer symbol.

E.g.f.: (1 + 2*x)^(-5/2)*(x*(x + 2)*sqrt(1 + 2*x) + (2*x^3 - 2*x)) * exp(-1 + sqrt(1 + 2*x)). (End)

G.f.: (6*x^2/(1-x)^5)*hypergeometric2f0(3,5/2; - ; -2*x/(1-x)^2). - G. C. Greubel, Aug 16 2017

MATHEMATICA

Table[Sum[(n+k+2)!*(-1)^k/(2^(k+2)*(n-k-2)!*k!), {k, 0, n-2}], {n, 0, 20}] (* Vaclav Kotesovec, Jul 22 2015 *)

Join[{0, 0}, Table[4*n*(n - 1)*Pochhammer[1/2, n]*(-2)^(n - 2)* Hypergeometric1F1[2 - n, -2*n, -2], {n, 2, 50}]] (* G. C. Greubel, Aug 14 2017 *)

PROG

(PARI) for(n=0, 50, print1(sum(k=0, n-2, (n+k+2)!*(-1)^k/(2^(k+2)*(n-k-2)!*k!)), ", ")) \\ G. C. Greubel, Aug 14 2017

CROSSREFS

Cf. A001518, A001516.

Sequence in context: A086984 A000894 A112117 * A126779 A218441 A120973

Adjacent sequences:  A065941 A065942 A065943 * A065945 A065946 A065947

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Dec 08 2001

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 18 06:21 EST 2019. Contains 320245 sequences. (Running on oeis4.)