55081

Appears in sequences

• a(n)*a(n-9) = a(n-1)*a(n-8)+a(n-4)+a(n-5) with initial terms a(1)=...=a(9)=1.at n=29A133847
• Number of ways to reciprocally link elements of a 4 X n array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.at n=11A220709
• Centered hexagonal numbers that are sphenic numbers.at n=12A382628
• a(n) = Sum_{k=0..floor(n/3)} binomial(4*n-3*k-3,n-3*k).at n=6A390708