-654

Appears in sequences

• Expansion of cos(log(1+x))/exp(x).at n=6A009027
• Triangle T(n,k), read by rows, defined by T(n,k)=3*T(n-1,k)-T(n-1,k-1)-T(n-2,k), T(0,0)=1, T(1,0)=2, T(1,1)=-1, T(n,k)=0 if k<0 or if k>n.at n=22A123971
• Triangle, matrix inverse of A124733, companion to A123965.at n=22A126124
• Triangle, read by rows, where T(n,k) is defined for n>=1, k=1..2*n-1, by a formula analogous to the second-order Eulerian triangle A008517.at n=29A219120
• G.f.: x^((k^2+k)/2)/(mul(1-x^i,i=1..k)*mul(1+x^r,r=1..oo)) with k = 4.at n=61A246583
• a(n) = Sum_{k=1..n} mu(k) * n^(k - 1).at n=4A344431
• Expansion of 2*(x - 1)^3/(3*x^3 - 5*x^2 + x + 1 + sqrt(-(x - 1)^3*(x + 1)^2*(3*x + 1))).at n=6A378816