25305

Appears in sequences

• a(n) = n*(n^3 - 1)/2.at n=13A027482
• Numbers of the form k*(k^3 +- 1)/2.at n=28A057590
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,3,9,11.at n=10A135365
• Numbers k such that k-4, k-2, k+2 and k+4 are prime.at n=21A173037
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 549", based on the 5-celled von Neumann neighborhood.at n=28A272844
• Numbers k such that sopfr(k) = tau(k)^2.at n=20A305026
• Triangle read by rows where T(n,k) is the number of non-isomorphic k-element multisets of nonempty multisets of nonempty multisets (all finite).at n=39A330472
• Number of vertices formed in a square by straight line segments when connecting the four corner vertices to the points dividing the sides into n equal parts.at n=38A355949
• a(n) = (1/2) * the imaginary part of Product_{k = 0..n} 1 + k*sqrt(-4).at n=6A363414