login
A095669
Seventh column (m=6) of (1,4)-Pascal triangle A095666.
0
4, 25, 91, 252, 588, 1218, 2310, 4092, 6864, 11011, 17017, 25480, 37128, 52836, 73644, 100776, 135660, 179949, 235543, 304612, 389620, 493350, 618930, 769860, 950040, 1163799, 1415925, 1711696, 2056912, 2457928, 2921688, 3455760, 4068372
OFFSET
0,1
COMMENTS
If Y is a 4-subset of an n-set X then, for n>=9, a(n-9) is the number of 6-subsets of X having at most one element in common with Y. - Milan Janjic, Dec 08 2007
FORMULA
G.f.: (4-3*x)/(1-x)^7.
a(n) = 4*b(n)-3*b(n-1) = (n+24)*binomial(n+5, 5)/6, with b(n):=binomial(n+6, 6)= A000579(n+6, 6).
CROSSREFS
Sequence in context: A303514 A041991 A027764 * A323967 A195509 A027949
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Jun 11 2004
STATUS
approved