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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 (list; graph; refs; listen; history; text; internal format)
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

LINKS

Table of n, a(n) for n=0..32.

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

Adjacent sequences:  A095666 A095667 A095668 * A095670 A095671 A095672

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Jun 11 2004

STATUS

approved

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Last modified June 19 05:30 EDT 2019. Contains 324218 sequences. (Running on oeis4.)