128800

Appears in sequences

• Series-parallel numbers.at n=6A000432
• Pisot sequences E(6,8), P(6,8).at n=35A020716
• Dying rabbits: a(n) = a(n-1) + a(n-2) - a(n-4).at n=41A023434
• Partial sums of A007587.at n=22A051799
• Triangle read by rows: T(n,k) is number of leaves at level k in all noncrossing rooted trees on n+1 nodes.at n=40A101372
• Expansion of g.f. x/((1-x)*(1-3*x+2*x^2-x^3)).at n=13A137229
• a(n) = A000931(n+4) - A010060(n).at n=44A140514
• Partial sums of A012814.at n=9A176476
• a(1) = greatest k such that H(k) - H(8) < H(8) - H(4); a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(8), and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.at n=16A227804
• Number of compositions of n into parts 2 and 3 with at least one 2 and one 3.at n=45A245332
• The number of partitions of [n] with exactly 2 blocks without peaks.at n=21A289692