20114

Appears in sequences

• Coordination sequence for MgCu2, Mg position.at n=35A009931
• Quadruples of different integers from [ 1,n ] with no common factors between pairs.at n=45A015623
• Quadruples of different integers from [ 2,n ] with no common factors between pairs.at n=45A015628
• Expansion of 1 / ((1-x)*(1-x+x^2+x^3)).at n=33A077872
• Expansion of (1-x)^(-1)/(1+x+x^2-x^3).at n=35A077908
• Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 6.at n=3A154056
• Number of ordered quintuples of distinct pairwise coprime positive integers with largest element n.at n=40A186976
• Conjecturally, the largest k such that prime(n)^2 is the largest squared prime divisor of binomial(2k,k).at n=35A239623
• Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=9A252376
• Number of n-step self-avoiding walks on the square Manhattan lattice that do not take two consecutive turns.at n=20A364580