11612160

Appears in sequences

• Ratios of successive terms are 1,2,2,2,3,4,4,4,5,6,6,6,7,...at n=13A004528
• a(n) = order of the orthogonal group O_n(2) if n is odd or O^(+)_n(2) if n is even.at n=3A028666
• Triangle read by rows: T(n,k) = k!*binomial(n-1,k-1)*Stirling2(n,k), 1 <= k <= n.at n=43A048743
• E.g.f. x^4/(1-2x).at n=9A052652
• Expansion of e.g.f. x^3*(1-x)/(1-2*x).at n=9A052671
• Number of labeled order relations on n nodes in which longest chain has n-1 nodes.at n=7A055533
• a(n) = 2^n*(n+1)*(3*n)!.at n=3A065142
• Triangular array of coefficients multiplied by n! of polynomials in e. These give the expected number of trials needed for the sum of uniform random variables from the interval [0,1] to exceed n+1.at n=47A089087
• Startorial numbers: product of initial digits of integers 1 through n.at n=23A109834
• Denominators of the coefficients of the series for InverseErf(x).at n=4A122551
• a(n) is number of permutations (p(1),p(2),p(3),...,p(n)) of (1,2,3,...,n) such that p(k) is coprime to p(n+1-k) for k = all positive integers <= n.at n=11A133922
• a(n) is number of permutations (p(1),p(2),p(3),...,p(n)) of (1,2,3,...,n) such that p(k) is coprime to p(n+1-k) for k = all positive integers <= n.at n=12A133922
• A bisection of A028666.at n=1A144546
• Product of the arithmetic derivatives from 2 to n.at n=13A165559
• E.g.f.: -log( sqrt(1-x^2) - x ).at n=9A194349
• a(0)=1; thereafter a(n) = n*a(n-1) if n is even, otherwise a(n) = 2*n*a(n-1).at n=9A232205
• a(n) is the minimal product of a positive integer sequence of length n with no duplicate substrings of length greater than 1.at n=21A282164
• Triangle read by rows where T(n,k), n>=1, 1<=k<=n is the number of (0,1)-matrices of size n with the first row and column sum = k and remaining sums = 1.at n=47A308498
• Number of double-closed subsets of {1..n}.at n=32A308546
• Sum of the odd divisors of the primorial inflation of n.at n=18A337204