a(n) = Sum_{k=4..n} ( binomial(n,k)*(k-2)*(2^k-2*k-2) ) - (2^n-n-1).
A328088
a(n) = Sum_{k=4..n} ( binomial(n,k)*(k-2)*(2^k-2*k-2) ) - (2^n-n-1).
Terms
- a(0) =1a(1) =94a(2) =683a(3) =3520a(4) =15461a(5) =61826a(6) =232543a(7) =838276a(8) =2930585a(9) =10014406a(10) =33633299a(11) =111448904a(12) =365403853a(13) =1187875594a(14) =3834883271a(15) =12309375244a(16) =39320806145a(17) =125090127950a(18) =396537120379
External references
- oeis: A328088