68544

Appears in sequences

• Triangle read by rows: T(n, k) = number of matchings of 2n people with partners (of either sex) such that exactly k couples are left together.at n=49A055140
• Least number m such that cardinality of InvPhi(m) = prime(n).at n=37A071389
• Sum of terms of n-th row of A077321.at n=23A077324
• E.g.f. satisfies: A(x) = x*(sinh(tan(A(x)))+1).at n=7A133822
• E.g.f. satisfies: A(x) = x*(tan(sinh(A(x)))+1).at n=7A133892
• Number of reduced 3 X 3 semimagic squares with magic sum n.at n=31A173728
• Triangular array read by rows: T(n,k) is the number of ordered set partitions of {1,2,...,n} with exactly k singletons, n>=0, 0<=k<=n.at n=39A187784
• Numbers with prime factorization pqr^2s^6.at n=12A190474
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+239)^2 = y^2.at n=10A204765
• Triangle of numbers where T(n,k) is the number of k-dimensional faces on a partially truncated n-cube, 0 <= k <= n.at n=49A271316
• Number of 5-cycles in the n-triangular graph.at n=8A290939
• Numbers n that equal the sum of their first k consecutive aliquot bi-unitary divisors, but not all of them (i.e k < A286324(n)-1).at n=7A293618
• El Gradechi's hybrid coefficients alpha^{4,6}_n.at n=6A331769
• Expansion of e.g.f. exp( log(1 - x)^4 / 4! ).at n=9A347003
• E.g.f. satisfies A(x) = 1/(1 - x)^(x^3 * A(x)).at n=8A356099
• a(n) is the least number with exactly n divisors of the form 5*k+1.at n=20A364586
• a(n) is the least number with exactly n divisors of the form 5*k+4.at n=21A364600
• Expansion of e.g.f. -log( 1 - log(1 - x)^4 / 24 ).at n=9A379674
• Triangle read by rows: T(n,k) is the number of sensed combinatorial maps with n edges and k vertices, 1 <= k <= n + 1.at n=41A380615
• a(n) is the first number with a total of exactly n 4's in the decimal digits of its divisors.at n=39A386391