33016

Appears in sequences

• a(n) = n^4 - 6*n^3 + 12*n^2 - 4*n + 1.at n=15A027382
• Numerator of Sum_{k=1..n} 1/A045542(k).at n=6A214390
• Number of n-length words on {1,2,3,4} such that the maximal runs of identical odd integers are of odd length and the maximal runs of identical even integers are of even length.at n=12A242536
• a(n) is the number of unlabeled rank-3 graded lattices with 4 coatoms and n atoms.at n=36A322599
• E.g.f. A(x) satisfies: A(x) = 1 + Integral (x/A(x))' / (x/A(x)^2)' dx.at n=6A338193