371910

Appears in sequences

• a(n) = 2*(n+1)*binomial(n+3,4).at n=19A027789
• Triangle read by rows: T(n,k) is the number of permutations p of [n] such that the length of the longest 2-stack sortable initial segment of p is equal to k.at n=52A094785
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 322560.at n=25A266387
• Numbers k such that phi(phi(k))/k < phi(phi(m))/m for all m < k, where phi is Euler's totient function (A000010).at n=24A293714
• a(n) = Product_{d|n, d>1} prime(A318881(d)), where A318881(d) records the prime signature of A000010(d).at n=55A319344