20218

Appears in sequences

• Number of points on surface of truncated tetrahedron: a(n) = 14*n^2 + 2 for n > 0, a(0)=1.at n=38A005905
• Difference between A007678(2n)/(2n) and (n-1)^2.at n=41A085611
• Triangle read by rows: T(n,k) is the number of permutations of [n] with exactly k increasing runs of even length.at n=25A097592
• Number of permutations of [n] with no increasing runs of even length.at n=9A097597
• a(n+1) = a(n) + floor(a(n)/4) with a(0)=4.at n=40A182305
• Number of regions in the hyperoctahedral (or cocktail party) graph of order n.at n=14A368755