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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A082570 a(1)=1, a(n)=ceiling(n*(a(n-1)+1/a(n-1))). 0
 1, 4, 13, 53, 266, 1597, 11180, 89441, 804970, 8049701, 88546712, 1062560545, 13813287086, 193386019205, 2900790288076, 46412644609217, 789014958356690, 14202269250420421, 269843115757988000, 5396862315159760001, 113334108618354960022, 2493350389603809120485 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..22. FORMULA a(1)=1 and for n>1, a(n)=floor((e-1/2)*n!) MATHEMATICA Join[{a = 1}, Table[a = Ceiling[n*(a + 1/a)], {n, 2, 30}]] PROG (PARI) a(n)=if(n<2, 1, floor((exp(1)-1/2)*n!)) CROSSREFS Sequence in context: A149466 A369226 A006604 * A145208 A149467 A149468 Adjacent sequences: A082567 A082568 A082569 * A082571 A082572 A082573 KEYWORD nonn AUTHOR Benoit Cloitre, May 06 2003 STATUS approved

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.

Last modified July 22 22:22 EDT 2024. Contains 374544 sequences. (Running on oeis4.)