OFFSET
3,1
LINKS
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
KEYWORD
nonn
AUTHOR
Alexander Evnin, Dec 26 2008
STATUS
approved