-4800

Appears in sequences

• sech(sinh(x)*arctan(x))=1-12/4!*x^4+120/6!*x^6+1680/8!*x^8...at n=5A012565
• Triangle: r=23;l=7;m(r,l,n)=(r - l)*IdentityMatrix[n] + l*Table[1, {i, 1, n}, {j, 1, n}].at n=18A157981
• Determinant of power series with alternate signs of gamma matrix with determinant 3!.at n=3A158046
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of min{1+(j mod i), 1+( i mod j)} (A204014).at n=54A204015
• E.g.f. A(x) satisfies: (A(x)^2 - 4*x)^3 = (2 - A(x)^3)^2.at n=6A249786