20167

Appears in sequences

• Binomial transform of reflected tetranacci numbers A074058: a(n)=Sum((-1)^k Binomial(n,k)*A074058(k),(k=0,..,n)).at n=12A075129
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 617", based on the 5-celled von Neumann neighborhood.at n=25A273248
• Number of points that are the intersections of exactly two semicircles in the configuration A290447(n).at n=29A292103
• Numbers n such that (6k-1) for k=n, n+1, n+2, n+3 are all primes with no primes of the form (6k+1) in between.at n=22A296011
• Starts of runs of 4 consecutive Gray-code Niven numbers (A344341).at n=26A344344
• Irregular triangle read by rows: T(n,k) (0 <= k <= n^2) are coefficients of cluster density function for site percolation on an n X n 2D triangular lattice with open boundary conditions.at n=23A365945
• a(n) = Sum_{k = 0..n} binomial(n, k)^2*binomial(n+k, k)^2*A108625(n, n-k).at n=3A376464