11059200

Appears in sequences

• Number of Hamiltonian cycles in the directed graph with 2n nodes {0..2n-1} and edges from each i to 2i (mod 2n) and to 2i+1 (mod 2n).at n=29A027362
• Euler totient function phi values of multiperfect numbers.at n=13A098203
• Hankel transform of quartic (or 4-fold) factorial numbers A007696.at n=3A169619
• Product of the numbers in the Collatz (3x+1) trajectory of n, including n.at n=11A178168
• Numbers in A178168, sorted.at n=12A178169
• Sorted number of edges of distinct solutions in the mix of 2 or 3 regular convex 4-polytopes.at n=25A199808
• G.f.: Sum_{n>=0} (4*n+1)^n * x^n / (1 + (4*n+1)*x)^n.at n=6A221160
• Multiply a(n) by the first digit of a(n+1) to get a(n+2). The sequence starts with a(1) = 1 and a(2) = 2.at n=32A300759