20542

Appears in sequences

• Number of inverse pairs of elements in symmetric group S_n, or pairs of total orders on n nodes (average of A000085 and A000142).at n=8A007868
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFI = ZSM-5 Nan[AlnSi96-nO192] starting with a T6 atom.at n=13A019163
• Number of powerful numbers between 2^(n-1)+1 and 2^n.at n=30A062761
• a(n) = (concatenation of the first n terms of A099552)/n.at n=5A083161
• Diagonal of array A085205.at n=20A085228
• Central terms of the rows of triangle A115323.at n=12A115324
• Convolution square of A003106.at n=44A145468
• a(n) = p(n)*p(n+2) - 3*p(n+1), where p(n) is the n-th prime.at n=33A152528
• a(0)=2, a(n) = n^2+a(n-1).at n=39A153056
• Numbers x such that 0 < |x^7 - y^2| < x^(5/2) for some number y.at n=8A173348
• a(n) = A056520(n)+1 for n>0, a(0)=1.at n=39A179904
• Triangle of coefficients of polynomials v(n,x) jointly generated with A208761; see the Formula section.at n=49A208762
• a(n) = 36*n^2 - 8*n - 2 (n >=1).at n=23A304834