1935360

Appears in sequences

• Ratios of successive terms are 1,2,2,3,4,4,5,6,6,...at n=11A004527
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*6^j.at n=31A038236
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*4^j.at n=32A038258
• Expansion of e.g.f. (1-sqrt(1-8*x))/2.at n=6A052713
• Expansion of e.g.f. x*(1-2*x)*(1 - 2*x - sqrt(1-4*x))/2 - x^3.at n=8A052721
• Number of n X n invertible binary matrices A such that A^3+I is invertible.at n=4A053060
• Sum of non-unitary divisors of central binomial coefficient C(n, floor(n/2)).at n=23A064141
• Numbers n such that (n, sigma(n)) lies on the hyperbola y^2 - x^2 = m^2, for some natural number m, i.e., sigma(n)^2 - n^2 = m^2.at n=7A066784
• Triangle read by rows: T(m,k) = normalized partial derivative of (t,z) -> exp(t*g(z)) at (0,0), where 2*g(z) = 1 + exp(-2*z*g(z)).at n=26A078751
• a(n) = Product_{k|n} k!.at n=7A098710
• Denominator of Cotesian number C(n,3).at n=8A100648
• Terms of A110142 at positions p(n)+1, where p(n) = A000041(n) is the number of partitions of n; a(n) = A110142(p(n)+1) for n>=1, with a(0) = 1.at n=16A110144
• Number of permutations on 1..n where gcd(s_i,n) = gcd(i,n). Also Product_{d divides n} phi(d)!.at n=15A120065
• Number of permutations on 1..n where gcd(s_i,n) = gcd(i,n). Also Product_{d divides n} phi(d)!.at n=14A120065
• Product of the nonzero digital products of n for all the bases 1 to n (a 'total digital-product factorial').at n=15A131387
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k entries divisible by 3 that are followed by a smaller entry (n>=1, k>=0).at n=28A136718
• Triangle read by rows: T(n,m)=floor[(m/n)*row(n)].at n=39A152969
• Triangle read by rows: T(n,m)=floor[(m/n)*row(n)].at n=41A152969
• n! / (Product{k|n} k$). Here '$' denotes the swinging factorial function (A056040).at n=16A163089
• The lower left triangle of the ED1 array A167546.at n=31A167557