237600

Appears in sequences

• Series for second parallel moment of square lattice (eventually changes sign).at n=13A006733
• Triangle read by rows. First in a series of triangular arrays counting permutations of partitions.at n=59A092271
• a(n) = the number of aperiodic subsets S of the n-th roots of 1 with zero sum (i.e., there is no r different from 1 such that r*S=S).at n=49A110981
• Denominator of Sum_{i=1..n} 1/(i^2*binomial(2*i,i)).at n=6A134805
• a(n) = number of elements of order n in simple group Alt(11) of order 19958400.at n=6A145822
• Number of degree-n permutations of order exactly 7.at n=10A153760
• Number of reduced 3 X 3 magilatin squares with largest entry n.at n=35A174018
• Triangular array read by rows: T(n,k) is the number of n-permutations that are pure cycles having exactly k fixed points; n>=2, 0<=k<=n-2.at n=49A211603
• Number T(n,k) of 2n-length strings of balanced parentheses of exactly k different types; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=26A256061
• Numbers with prime factorization Product_{k=1..w} prime(i_k) ^ e_k (where w = A001221(n) and prime(i) denotes the i-th prime number) such that i_k <> e_k for k = 1..w and { i_1, ..., i_w } = { e_1, ..., e_w }.at n=34A320252
• Numbers with exactly four distinct exponents in their prime factorization, or four distinct parts in their prime signature.at n=16A323025
• Numbers whose ordered prime signature is equal to the set of distinct prime indices in decreasing order.at n=33A324571
• Terms of A301517 that are not exponentially odd numbers (A268335).at n=21A335989
• a(n) is the least number k such that A355032(k) = n, or -1 if no such k exists.at n=37A355033
• a(n) is the smallest n-gonal pyramidal number with exactly n prime factors (counted with multiplicity).at n=8A358865
• Numbers k where A093653(k)/A000120(k) sets a new record.at n=31A360641
• Minimum crossing number at which there are n torus knots.at n=35A379242