20318

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MOR = Mordenite Na8[Al8Si40O96].24H2O starting with a T2 atom.at n=13A019180
• Number of ways to partition n elements into pie slices each with at least 2 elements allowing the pie to be turned over.at n=28A032278
• Multiplicity of highest weight (or singular) vectors associated with character chi_158 of Monster module.at n=39A034546
• Numbers k for which 6k+1, 24k+5, 432k^2+72k-1, and 432k^2+90k-1 are all prime.at n=24A175513
• Number of partitions p of n such that the multiplicity of min(p)*max(p) is a part.at n=38A240498
• Number of 5 X n 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.at n=15A281473
• Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.at n=18A296025
• Partial sums of A108754.at n=41A307673
• a(n) = Sum_{k=1..n-1} k^2*phi(k) + n^2*phi(n)/2, where phi = A000010.at n=17A333293
• Numerators of the partial alternating sums of the reciprocals of the Dedekind psi function (A001615).at n=38A357820