638668800

Appears in sequences

• a(n) = n!*(3*n-1)/2.at n=10A066118
• Denominator of S(n)/Pi^n, where S(n) = Sum((4k+1)^(-n),k,-inf,+inf).at n=11A068205
• a(1)=2; a(n)=ceiling(n*(a(n-1)-1/a(n-1))).at n=11A082569
• The coefficients (times n!) of the expansion of the sum {k=1 to Inf.} of Tan(x^n).at n=12A176475
• Denominator of the rational part of the sum of reciprocals of even powers of odd numbers, i.e., Sum_{k>=1} 1/(2*k-1)^(2*n).at n=5A276593
• a(n) is the minimal product of a positive integer sequence of length n with no duplicate substrings (forward or backward) of length greater than 1, and no self-adjacent terms.at n=19A282170
• a(n) = n*a(n-1) + n!, with n>0, a(0)=5.at n=11A282466
• Product of Heinz numbers over all integer partitions of n.at n=5A325501
• Expansion of e.g.f. Sum_{k>=1} arctanh(x^k).at n=11A330505
• Distinct values of the least common multiple of initial segments of numbers of least prime signature (A025487).at n=20A343458
• Amicable numbers k that can be expressed as a sum k = x+y = A001065(x) + A001065(y) and a sum k = z+t = A001065(z) + A001065(t) where (x, y, z, t) are parts of two amicable pairs and A001065(i) is the sum of the aliquot parts of i.at n=9A359334
• Triangle read by rows: T(n, k) = (-1)^k*Product_{j=0..k-1} (j - n)*(j + n), for 0 <= k <= n.at n=41A370707
• E.g.f. A(x) satisfies A(x) = (1+x) * exp(x^3 * A(x)).at n=11A389820