68637

Appears in sequences

• a(n) = Sum_{d|n} phi(d^4).at n=19A068970
• Number of two-rowed partitions of length 5.at n=34A070558
• T(n,k)=Number of ways to reciprocally link elements of an nXk array either to themselves or to exactly two horizontal or antidiagonal neighbors.at n=58A220632
• Number of ways to reciprocally link elements of an 4 X n array either to themselves or to exactly two horizontal or antidiagonal neighbors.at n=7A220634