77472

Appears in sequences

• Product of sums of divisors and non-divisors.at n=41A066859
• a(n) = phi(Padovan(n+4)).at n=45A107797
• Expansion of the generating function of quartic rooted planar Eulerian orientations, counted by vertices.at n=4A324314
• Keys added to a map T initialized with T[1] = 1 and updated at each iteration according to T[value] := (T[value] if defined else 0) + key, for all (key, value) pairs already in T; listed in order the keys are added to the map (cf. comments for details).at n=51A390939
• Value of T[4] after the n-th iteration, when the map T is initialized with T[1] = 1 and in subsequent iterations, T[v] = k + (T[v] if defined else 0) for all key-value pairs (k, v) in T; a(n) = 0 if T[4] isn't defined yet.at n=20A390944