9031680

Appears in sequences

• Matrix square of unsigned Lah triangle abs(A008297(n,k)) or A105278(n,k).at n=29A079621
• A triangular sequence based on expansion of the rational polynomial of A001788 as a Sheffer sequence: p(x,t)=Exp[x*t]*(-1/(2*t - 1)^3).at n=29A138192
• List of pairs (a(n),b(n)): f(n) = A004001(n); a(n) = f(n) + a(n-1); b(n) = f(n)*b(n-1).at n=27A154280
• Partial products of A004001.at n=13A172452
• Triangular array read by rows: T(n,k) is the number of f:{1,2,...,n}->{1,2,...,n} with exactly 2k elements that have a preimage of even (possibly zero) cardinality; n>=0, 0<=k<=floor(n/2).at n=22A225942
• Number of 5-colorings of the strong product of the complete graph K2 and the cycle graph Cn.at n=7A229031
• Triangle read by rows: T(n,L) = number of rho-labeled graphs with n edges whose labeling is bipartite with boundary value L.at n=34A255908
• Expansion of x^5*(4 - 5*x)/(1 - 2*x)^4.at n=18A268598
• A variant of payphone permutations: given a circular booth with n payphones, a(n) is the number ways for n people to choose the payphones in order, where each person chooses an unoccupied payphone such that the closest occupied payphone is as distant as possible.at n=13A361296