This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A045626 Bends in loxodromic sequence of spheres in which each 5 consecutive spheres are in mutual contact. 1
 -1, 2, 3, 3, 5, 14, 23, 42, 81, 155, 287, 542, 1023, 1926, 3623, 6827, 12857, 24210, 45591, 85862, 161693, 304499, 573435, 1079898, 2033663, 3829802, 7212299, 13582227, 25578093, 48168758, 90711575, 170828354 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES H. S M Coxeter, 5 spheres in mutual contact, Abstracts AMS 18 (1997), p. 431, #924-05-202; also Math. Intell. 19(4) 1997 pp. 41-47. LINKS FORMULA G.f.: [ -2x^4-x^3+2x^2+3x-1]/[(1+x)(1-2x+x^2-2x^3+x^4)] (conjectured). - Ralf Stephan, May 06 2004 MAPLE A045626 := proc(n) option remember; if n=0 then -1 elif n=1 then 2 elif n<=3 then 3 elif n=4 then 5 else A045626(n-1)+A045626(n-2)+A045626(n-3)+A045626(n-4)-A045626(n-5); fi; end; CROSSREFS Sequence in context: A064339 A174010 A053199 * A275914 A154923 A154693 Adjacent sequences:  A045623 A045624 A045625 * A045627 A045628 A045629 KEYWORD sign AUTHOR 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.

Last modified March 23 05:36 EDT 2019. Contains 321422 sequences. (Running on oeis4.)