25835

Appears in sequences

• Triangle read by rows: T(n,k) is the number of k-matchings in the P_4 X P_n lattice graph.at n=30A100265
• Triangle of coefficients of polynomials p_n(x) (exponents in increasing order) where 2^(x-n-1)p_n(x)/n! counts the ways a game of Nim with two piles of sizes x and n can be played out (x > 0, n >= 0).at n=17A289329
• Number of vertices in a graph of n adjacent rectangles in a row with all possible diagonals drawn, as in A306302, but without the rectangles' edges which are perpendicular to the row.at n=20A369176