176320

Appears in sequences

• a(n) is square mod a(i), i < n; a(n) nonsquare; a(1) = 2.at n=24A034901
• a(n) = A129150(n) / 4, where A129150(n) = n-th arithmetic derivative of 2^3.at n=14A129284
• a(n) = A129151(n) / 27.at n=13A129285
• Number of n X 2 0..3 arrays with every element equal to either the sum mod 4 of its vertical neighbors or the sum mod 4 of its horizontal neighbors.at n=7A183485
• Number of nX8 0..3 arrays with every element equal to either the sum mod 4 of its vertical neighbors or the sum mod 4 of its horizontal neighbors.at n=1A183491
• T(n,k)=Number of nXk 0..3 arrays with every element equal to either the sum mod 4 of its vertical neighbors or the sum mod 4 of its horizontal neighbors.at n=37A183492
• T(n,k)=Number of nXk 0..3 arrays with every element equal to either the sum mod 4 of its vertical neighbors or the sum mod 4 of its horizontal neighbors.at n=43A183492
• Number of 6-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions.at n=17A187301
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of edges in that figure.at n=37A337702