184800

Appears in sequences

• Expansion of e.g.f. arcsinh(exp(x) - sec(x)).at n=11A013334
• Numbers k such that sigma(k) >= 4*k.at n=31A023198
• a(n) = n*(n-1)*(n-2)^2.at n=20A047927
• Triangle read by rows, the Bell transform of n!*binomial(2,n) (without column 0).at n=50A049404
• Factorial splitting: write n! = x*y*z with x<y<z and x maximal; sequence gives value of x.at n=15A061030
• Numbers k such that sigma(k) > 4*k.at n=29A068404
• Numbers that can be expressed as the difference of the squares of primes in exactly ten distinct ways.at n=12A092006
• Triangle of nonzero coefficients of the Airy zeta functions expressed as polynomials of X = 3^(5/6)Gamma(2/3)^2/(2Pi).at n=32A096631
• Denominators of the leading coefficient of the Airy zeta functions expressed as polynomials of X = 3^(5/6)Gamma(2/3)^2/(2Pi).at n=10A096632
• a(n) is the number of partial bijections (or subpermutations) of an n-element set with exactly 2 fixed points.at n=8A144087
• T(n,k) is the number of partial bijections (or subpermutations) of an n-element set with exactly k fixed points.at n=38A144088
• Tetrahedron of numbers T(i,j,k) = (i+2*j+3*k)!/(i!*j!*k!*2^j*6^k) read with entries in the order defined in A144625.at n=51A144626
• Triangle read by rows: T(n, k) = binomial(n, k)/Beta(n+1, n-k+1) + binomial(n, n-k)/Beta(n+1, k+1).at n=31A156052
• Triangle read by rows: T(n, k) = binomial(n, k)/Beta(n+1, n-k+1) + binomial(n, n-k)/Beta(n+1, k+1).at n=32A156052
• Number of permutations of 1..n with the sequence of sums of 3 adjacent elements having exactly 1 maximum.at n=8A179716
• Molecular topological indices of the graph join C_n + C_n of cycle graphs.at n=27A192848
• Numbers n whose divisors can be partitioned into four disjoint sets whose sums are all sigma(n)/4.at n=29A204831
• Array read by antidiagonals: T(m,n) = m * Sum(1<=i<=m) (m+n-2+i)!at n=13A211367
• Numbers n such that n and n^4 are sums of two twin primes.at n=26A212430
• 1-quantum transitions in systems of N spin 1/2 particles, in columns by combination indices. Triangle read by rows, T(n, k) for n >= 1 and 0 <= k <= floor((n-1)/2).at n=33A213343