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, 15, 86, 634, 3956, 18549, 69065
Offset: 3
Keywords
Links
- A. Evnin, An elementary Introduction to Matroids, Mathematical Education 2 (33) (2005), 2-33
Crossrefs
Cf. A055503
Formula
a(n)=1+(n^9-9n^8+6n^7+180n^6-663n^5+369n^4+3536n^3-8964n^2+2952n)/1296