1088640

Appears in sequences

• Number of labeled groups.at n=9A034383
• Triangle read by rows: T(n,k) = n!*k.at n=38A051683
• a(n) = 3*n!.at n=9A052560
• E.g.f. (1-x)/(1-x-x^4).at n=9A052581
• E.g.f. (1-x^3)/(1-x^2-x^3).at n=9A052607
• E.g.f. 1/((1-x)(1-x^4)).at n=9A052614
• Expansion of e.g.f. 3*x^3/(1-x).at n=9A052619
• E.g.f. 3x(1+x-x^2)/(1-x).at n=9A052637
• Expansion of e.g.f. x/((1-x)*(1-x^3)).at n=9A052688
• Expansion of e.g.f.: (1 - 4*x + 3*x^2)*(1 - 2*x - sqrt(1-4*x))/2 - x^2 + 2*x^3.at n=8A052720
• Triangle T(n,k) of associated Lah numbers, n>=2, k=1..floor(n/2).at n=17A076126
• Least multiple of n! sandwiched between twin primes, or 0 if no such number exists.at n=8A090531
• Expansion of e.g.f.: -1/(1+x-x^3).at n=9A109582
• First four terms of the sequence are doubled, then those numbers are tripled and then those numbers are quadrupled, etc.at n=34A117826
• Triangle read by rows: T(n,k)=(k+1)*n!/2 (1<=k<=n).at n=40A123316
• a(1)=1. a(n+1) = n!/lcm(a(1),a(2),...,a(n)).at n=18A131120
• Triangle T(n,k), n>=1, 0<=k<=n-1, read by rows: T(n,k)/(n-1)! is the coefficient of x^k in polynomial p_n for the n-th row sequence of A145153.at n=45A145142
• Numbers n such that sigma(x) = n has more solutions x than any smaller n.at n=30A145899
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} in which k is an excedance (n >= 2, 1 <= k <= n-1). An excedance of a permutation p is a value j such that p(j) > j.at n=42A152883
• The sequence is a factorization of a designed multi-bifurcative triangle sequence: t(n,m)=A155582(n,m); f(n, m) = If[m <= Floor[n/2], f(m, 1)*f(n - m, 1)*t(n, m)].at n=24A155583