login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A344144 Decimal expansion of Sum_{n>=0} A000108(n)/n!. 0
5, 0, 9, 0, 6, 7, 8, 7, 2, 9, 3, 1, 7, 1, 6, 5, 6, 2, 2, 9, 7, 8, 6, 7, 7, 7, 1, 9, 9, 0, 7, 4, 9, 8, 4, 3, 7, 9, 7, 3, 8, 5, 1, 6, 8, 0, 2, 0, 9, 3, 7, 5, 6, 1, 6, 5, 2, 5, 1, 2, 7, 2, 4, 3, 1, 1, 0, 6, 5, 3, 6, 0, 2, 5, 8, 4, 9, 1, 7, 7, 9, 7, 4, 3, 9, 3, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..87.

FORMULA

Equals e^2 * BesselI(2,2) = A072334 * A229020. - Amiram Eldar, May 17 2021

EXAMPLE

5.09067872931716562297867771990749843797385168020937561652512724311065360258491...

MATHEMATICA

RealDigits[E^2 * BesselI[2, 2], 10, 100][[1]] (* Amiram Eldar, May 17 2021 *)

PROG

(PARI) suminf(n=0, (2*n)!/(n!*n!*(n+1)!)) \\ Michel Marcus, May 16 2021

CROSSREFS

Cf. A000108, A072334, A229020.

Sequence in context: A200422 A141431 A166011 * A266222 A266439 A132706

Adjacent sequences:  A344141 A344142 A344143 * A344145 A344146 A344147

KEYWORD

cons,nonn

AUTHOR

Ya-Ping Lu, May 10 2021

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 August 2 14:15 EDT 2021. Contains 346426 sequences. (Running on oeis4.)