93600

Appears in sequences

• Theta series of D_6 lattice.at n=38A008428
• Number of sublattices of index n in generic 4-dimensional lattice.at n=29A038991
• Number of double-free subsets of {1, 2, ..., n}.at n=20A050291
• a(n) = 20*C(2n,n)*(2n+1)/(n+4).at n=7A078820
• Partial sums of n 3-spaced triangular numbers beginning with t(3), e.g., a(2) = t(3)+t(6) = 6+21 = 27.at n=38A085788
• Numbers containing squares of Pythagorean triples in their divisor set.at n=25A096472
• a(n) = A062402(2^n-1).at n=14A096854
• A062402(x)=sigma(phi[x]) function is iterated; initial value=2^n; a(n)=largest term of trajectory.at n=14A097001
• Largest achievable determinant of a 4 X 4 matrix whose elements are the 16 consecutive integers n-15,...,n.at n=19A097696
• a(n) = 289*n^2 - 2*n.at n=17A158252
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 5.at n=29A160891
• Number of reduced words of length n in Coxeter group on 6 generators S_i with relations (S_i)^2 = (S_i S_j)^6 = I.at n=7A163922
• Sum of divisors of cubes.at n=29A175926
• Number of pairs of intersecting diagonals in the exterior of a regular n-gon.at n=33A211381
• Number of (w,x,y,z) with all terms in {1,...,n} and w > x < y >= z.at n=26A212501
• a(n) = n! * (number of mapping patterns on n).at n=6A254529
• Number of n X 3 arrays containing 3 copies of 0..n-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0.at n=6A268157
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0.at n=42A268159
• Number of regions in a regular drawing of the complete bipartite graph K_{n,n}.at n=27A290131
• Triangle read by rows, T(n, k) = [x^k](Sum_{k=0..n}(-1)^(n-k)*Stirling2(n, k)*k!* x^k)^2, for 0 <= k <= 2n.at n=33A290696