49448

Appears in sequences

• Coordination sequence for lattice D*_4 (with edges defined by l_1 norm = 1).at n=21A035471
• Triangle read by rows: T(n,k) is the number of Schroeder paths of length 2n having trapezoid weight k.at n=50A104552
• Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).at n=30A199911
• Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal or antidiagonal neighbors.at n=6A220629
• 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=61A220632
• Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal or antidiagonal neighbors.at n=4A220637
• Triangle read by rows: T(n,k) = number of neutral planar lambda terms of size n with k free variables (n >= 0, 1 <= k <= n+1).at n=29A246322