2520000

Appears in sequences

• Expansion of e.g.f. sec(tan(x)*arcsin(x)) (only even powers).at n=5A012385
• This table shows the coefficients of combinatorial formulas needed for generating the sequential sums of p-th powers of triangular numbers. The p-th row (p>=1) contains a(i,p) for i=1 to 2*p-1, where a(i,p) satisfies Sum_{i=1..n} C(i+1,2)^p = 3 * C(n+2,3) * Sum_{i=1..2*p-1} a(i,p) * C(n-1,i-1)/(i+2).at n=32A087127
• Second column (k=3) sequence of array A078740 ((3,2)-Stirling2) divided by 6.at n=4A091549
• a(1) = 1; for n>1, a(n) = least multiple of a(n-1) such that the termwise concatenation of a(n), a(n-1),...a(2), a(1) is prime.at n=8A111674
• E.g.f.: exp(Sum_{k>=1} (k-1)^3*x^k).at n=7A290690