login
2^(2n-6) * C(n,3) - 2^(n-2) * C(n,4).
0

%I #10 Oct 12 2016 13:10:37

%S 1,12,120,1040,7840,52864,327936,1912320,10644480,57164800,298428416,

%T 1522626560,7622451200,37551144960,182458122240,875972788224,

%U 4161315274752,19583780782080,91393766195200

%N 2^(2n-6) * C(n,3) - 2^(n-2) * C(n,4).

%F (n-3)*(n-4)*a(n) -2*(9*n-35)*(n-4)*a(n-1) +80*(n-1)*(n-5)*a(n-2) -96*(n-1)*(n-2)*a(n-3)=0. - _R. J. Mathar_, Sep 21 2013

%p f := n->2^(2*n-6)*binomial(n,3)-2^(n-2)*binomial(n,4);

%t Table[2^(2n-6) Binomial[n,3]-2^(n-2) Binomial[n,4],{n,3,30}] (* _Harvey P. Dale_, Oct 12 2016 *)

%K nonn

%O 3,2

%A _N. J. A. Sloane_, _Colin Mallows_