129978

Appears in sequences

• a(0)=0, a(1)=1, a(n)=a(n-1)+a(n-2)+a(n-3) if a(n-1) is even, a(n)=a(n-1)+a(n-2) if a(n-1) is odd.at n=23A078513
• Divide primes in groups with 2n elements and add together.at n=21A109726
• Number of (undirected) Hamiltonian paths in the n-dipyramidal graph.at n=24A307939