120456

Appears in sequences

• Number of disconnected 3-regular simple graphs on 2n vertices with girth exactly 4.at n=13A185034
• a(n) is the smallest n-digit number whose truncation after its first k digits is divisible by the k-th Lucas number (A000032(n)) for k = 1..n.at n=5A242810
• a(n) = Sum_{k=0..n} n^k * binomial(n+1,k) * binomial(n+1,k+1).at n=5A331794