211456

Appears in sequences

• E.g.f. exp(-x)*cosh(x)/(1-x)^2.at n=8A088127
• Triangle read by rows, n>=0, k>=0, T(0,0) = 1, T(n,k) = Sum_{j=0..k} (C(n+k,k-j)*(-1)^(k-j)*2^(n-j)*Sum_{i=0..j} (C(n+j,i)*|S(n+j-i,j-i)|)), S = Stirling number of first kind.at n=24A201636
• n * Lucas(n) - (n - 1) * Lucas(n - 1).at n=20A246715
• Triangle read by rows: T(n,k) = number of times the value k appears on the parking functions of length n.at n=25A298593
• Irregular triangle read by rows: T(n,k) = S1(n,k)*2^k, where S1(n,k) is the associated Stirling number of the first kind (cf. A008306) (n >= 0, 0 <= k <= floor(n/2)).at n=28A349479