18278

Appears in sequences

• a(n) = 2*binomial(n,3).at n=39A007290
• Number of 8-ary trees with n vertices.at n=5A007556
• Molien series for cyclic group of order 5.at n=36A008646
• a(n) = floor(C(n,4)/5).at n=40A011795
• a(n) = n^3 + n^2 + n.at n=26A027444
• a(n) = T(n,5), array T as in A051168; a count of Lyndon words; aperiodic necklaces with 5 black beads and n-5 white beads.at n=36A051170
• C((n+1)*2^(n-1),n)/(n+1).at n=4A136464
• a(n) = 13*n*(n+1).at n=37A173307
• a(n) = binomial(prime(n),s)/prime(n) where s is the sum of the decimal digits of prime(n).at n=8A176267
• Numbers k such that k^k = k (mod prime(k)).at n=6A177005
• a(n) = binomial(n^2 + 3*n, n) / (n+1)^2.at n=5A182316
• Number of (w,x,y,z) with all terms in {1,...,n} and w*x+y*z<=n^2.at n=12A212150
• Degrees of irreducible representations of Ree group R(27).at n=14A214486
• Degrees of irreducible representations of Ree group R(27).at n=15A214486
• Degrees of irreducible representations of Ree group R(27).at n=16A214486
• Degrees of irreducible representations of Ree group R(27).at n=17A214486
• Numbers n such that sigma(sigma*(n)) = sigma*(sigma(n)), where sigma*(n) is the sum of anti-divisors of n (A066417).at n=4A230373
• a(n) = binomial(n+4,4)*gcd(n,5)/5.at n=36A234042
• a(n) = binomial(5*(n+1),4)/5, with n >= 0.at n=7A234043
• Size of the smallest conjugacy class of size greater than 1 of the alternating group of degree n.at n=35A237036