A391795 - OEIS

%I #11 Dec 21 2025 10:47:14

%S 1,0,2,5,7,11,17,23,31,40,47,56

%N Largest possible index of a topological sequence of three dimensional lattice points with depth n.

%C See A387672 for the definition of a topological sequence.

%e Out of the 6 topological sequences with depth 3, {(0, 0, 0), (1, 0, 0), (0, 1, 0)} has the largest index of 5, so a(3) = 5.

%Y Cf. A000219, A000293, A002836, A207542, A387672.

%K nonn,more

%O 0,3

%A _John Tyler Rascoe_, Dec 20 2025