23109

Appears in sequences

• Convolved Fibonacci numbers.at n=13A001628
• Bisection of Fibonacci triangle A037027: odd-indexed members of column sequences of A037027 (not counting leading zeros).at n=38A060921
• Third column (m=2) of triangle A060921 (bisection of Fibonacci triangle, odd part).at n=6A061182
• Positive integers k such that k!!! - 1 = A007661(k) - 1 is prime.at n=21A084438
• Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n and having k weak ascents (1 <= k <= ceiling(n/3)).at n=52A114711
• Triangle of coefficients of (1 - x)^n*U(n,-(3*x - 2)/(2*x - 2)), where U(n,x) is the n-th Chebyshev polynomial of the second kind.at n=42A123027
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=13A193041
• Triangle read by rows: T(n,k) is the number of secondary structures of size n (n>=0) having k stacks of length 1 (k>=0).at n=58A202838
• Number of 3 X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=8A224001
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 517", based on the 5-celled von Neumann neighborhood.at n=28A272732
• Semiprimes of the form k^2 + 5.at n=43A361696
• E.g.f. satisfies A(x) = 1/(1 - A(x)^3 * (exp(x*A(x)^3) - 1)).at n=4A377498