1198080

Appears in sequences

• Expansion of e.g.f. tan(tan(tan(x))).at n=4A003720
• Number of degree-n irreducible polynomials over GF(4) with trace 0 and subtrace 0.at n=13A074031
• Number of degree-n irreducible polynomials over GF(4) with trace 0 and subtrace 1.at n=13A074032
• Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace 0.at n=13A074033
• Number of degree-n irreducible polynomials over GF(4) with trace 1 and subtrace 1.at n=13A074034
• Number of 4-ary Lyndon words of length n over Z_4 with trace 0 and subtrace 3.at n=13A074405
• Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 2.at n=13A074412
• Number of 4-ary Lyndon words of length n over GF(4) with trace 0 and subtrace 0.at n=13A074446
• Number of 4-ary Lyndon words of length n over GF(4) with trace 0 and subtrace 1.at n=13A074447
• Let x = RootOf(z^2 + z + 1) and y = 1+x. Number of 4-ary Lyndon words of length n over GF(4) with trace 1 and subtrace x.at n=13A074450
• Determinant of the upper left n X n elements of the array T(n, m) in A109626.at n=11A111605
• a(n) = product of the positive integers k, k <= n, such that the positive integers <= k and coprime to k are also coprime to n.at n=25A124675
• a(n) = Product_{k=1..n} floor((2*n+1)/k - 1).at n=13A207647
• Array A(i,j) read by antidiagonals: A(i,j) is the (2*i-1)-th derivative of tan(tan(tan(...tan(x)))) nested j times evaluated at 0.at n=25A212267
• Expansion of x^4*(5 - 16*x + 13*x^2)/(1 - 2*x)^4.at n=16A268587
• a(n) = n*n! / Product_{k=1..n} radical(k), where radical(n) is the product of distinct prime factors of n, cf. A007947.at n=26A387151