This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A095669 #5 Oct 12 2012 14:40:20 %S A095669 4,25,91,252,588,1218,2310,4092,6864,11011,17017,25480,37128,52836, %T A095669 73644,100776,135660,179949,235543,304612,389620,493350,618930,769860, %U A095669 950040,1163799,1415925,1711696,2056912,2457928,2921688,3455760,4068372 %N A095669 Seventh column (m=6) of (1,4)-Pascal triangle A095666. %C A095669 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 %F A095669 G.f.: (4-3*x)/(1-x)^7. %F A095669 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). %K A095669 nonn,easy %O A095669 0,1 %A A095669 _Wolfdieter Lang_, Jun 11 2004