25376

Appears in sequences

• Binomial transform of central Delannoy numbers A001850.at n=6A080609
• 5th binomial transform of (1,0,1,0,1,...), A059841.at n=6A081187
• a(n) = (6^n + (-4)^n)/2.at n=6A083578
• a(n) = floor((product of composites among next n numbers)/(product of primes among next n numbers)).at n=7A094337
• Structured triakis tetrahedral numbers (vertex structure 4).at n=25A100175
• Positive integers with the property that if the base-3 representation is reversed the result is twice the original number.at n=9A173951
• Triangle read by rows: T(n,k) is the number of tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares) that have k L-shaped tiles.at n=58A245966
• Number of tilings of a 5 X 2n rectangle using 2n pentominoes of shapes P, U.at n=7A247121
• Start with a single pentagon; at n-th generation add a pentagon at each expandable vertex; a(n) is the sum of all label values at n-th generation. (See comment for construction rules.)at n=19A247619
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 497", based on the 5-celled von Neumann neighborhood.at n=31A272558
• Number of (undirected) longest paths in the n X n bishop graph.at n=4A307556
• Number of (undirected) Hamiltonian paths in the n X n black bishop graph.at n=4A307934
• Expansion of e.g.f. exp(exp(4*x) - 1 - 2*x).at n=5A367939
• Number of edges in a regular 2n-gon when all vertices are connect by straight lines except for the n lines joining diametrically opposite vertices.at n=12A368815
• Brent's irregular triangle T[r,k] related to Hardy-Littlewood constants of prime gaps 2r.at n=63A381083