280280

Appears in sequences

• Number of bipartite graphs with 3 edges on nodes {1..n}.at n=16A053526
• Numbers k not divisible by 6 such that sigma(k) > 3*k.at n=23A126104
• Triangle of coefficients c(n,i), 1<=i<=n, such that for each n>=2, c(n,i) are setwise coprime; and for all primes p>2n-1, the sum of (-1)^i*c(n,i)*binomial(i*p,p) is divisible by p^(2n-1).at n=30A268512
• Number of Dyck paths of semilength n such that each positive level has exactly nine peaks.at n=24A288325
• Resistance values R < 1 ohm, multiplied by a common denominator 360360 (= A338600(6)), that can be obtained from a network of exactly 6 one-ohm resistors, but not from any network with fewer than 6 one-ohm resistors.at n=18A338606
• Triangle read by rows: T(n, k) = binomial(n - 1, k - 1)*binomial(n + k, k).at n=51A386789