201810

Appears in sequences

• Bessel polynomial {y_n}''(2).at n=5A065945
• Triangle, read by rows, where g.f. of row n equals the product of (1-x)^n and the g.f. of the coordination sequence for root lattice B_n, for n >= 0.at n=59A109001
• Number of (undirected) paths in the n-triangular honeycomb queen graph.at n=3A289894
• Number of (undirected) Hamiltonian paths in the n-dipyramidal graph.at n=28A307939