88725

Appears in sequences

• a(n) = n^2*(n+1)*(n+2)^2/6.at n=13A004256
• Number of ways to color vertices of a hexagon using <= n colors, allowing only rotations.at n=9A006565
• Number of n-bead necklaces with 9 colors.at n=6A054628
• T(n,k) = Sum_{d|k} phi(d)*n^(k/d)/k, triangle read by rows, T(n,k) for n >= 1 and 1 <= k <= n.at n=41A054630
• Numbers for which the number of prime divisors counted with multiplicity and the sum of the distinct prime divisors are both perfect.at n=30A233563
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -1, a(1) = -1, a(2) = 2, a(3) = 1.at n=21A295852
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -2, a(1) = -1, a(2) = 0, a(3) = 1.at n=21A295861
• a(n) = (4*n^3 - 6*n^2 + 14*n + 3)/3.at n=41A321124
• Numbers that are divisible by the squares of two distinct primes and whose arithmetic derivative (A003415) is a squarefree number of the form 4k+2.at n=26A368697