-831

Appears in sequences

• Expansion of e.g.f. log(1+x)/exp(tan(x)).at n=6A009438
• Product_{k>=1}(1 + x^k)^a(k) = 1 + 3x.at n=7A038068
• McKay-Thompson series of class 27d for Monster.at n=68A058604
• This table (read by rows) shows the coefficients of sum formulas of n-th subfactorial numbers (A000166). The n-th row (n>=1) contains T(i,n) for i=1 to n, where T(i,n) satisfies Subf(n) = Sum_{i=1..n} T(i,n) * n^(n-i).at n=24A101559
• G.f.: Sum_{n>=0} (x^n - 1)^n * x^n / (1-x)^(n+1).at n=30A243919
• Signed version of A164984.at n=62A248810
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 417", based on the 5-celled von Neumann neighborhood.at n=17A272019
• a(n) = -(1/n) * Sum_{d|n} phi(n/d) * (-3)^d.at n=7A343465
• Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = -(1/n) * Sum_{d|n} phi(n/d) * (-k)^d.at n=52A382993
• a(n) = Sum_{i=1..n} i^2*(-1)^ceiling(sqrt(i)).at n=20A392677