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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A153445 Take n points in general position in space; draw all planes through all triples of these points; sequence gives number of connected regions formed. 2
 2, 15, 86, 634, 3956, 18549, 69065 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 LINKS Table of n, a(n) for n=3..9. A. Evnin, An elementary Introduction to Matroids, Mathematical Education 2 (33) (2005), 2-33 FORMULA a(n)=1+(n^9-9n^8+6n^7+180n^6-663n^5+369n^4+3536n^3-8964n^2+2952n)/1296 CROSSREFS Cf. A055503 Sequence in context: A328007 A098624 A116079 * A208974 A294196 A275794 Adjacent sequences: A153442 A153443 A153444 * A153446 A153447 A153448 KEYWORD nonn AUTHOR Alexander Evnin, Dec 26 2008 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 23 21:46 EDT 2024. Contains 374575 sequences. (Running on oeis4.)