112797domain: NAppears in sequencesExpansion of ( 1-x ) / ( 1-3*x+x^2-x^3+x^4 ).at n=12A052985Number of Hamiltonian paths in the graph on n vertices {1,...,n}, with i adjacent to j iff |i-j| <= 2.at n=28A069241a(n) = 3*a(n-1) - a(n-3), with a(0) = 3, a(1) = 3, and a(2) = 9.at n=11A215885