%I #9 Jun 15 2022 11:36:39
%S 1,3,9,21,42,67,109,145,207,255,337,397,499,571,693,777,919,1015,1177,
%T 1285,1467,1587,1789,1921,2143,2287,2529,2685,2947,3115,3397,3577,
%U 3879,4071,4393,4597,4939,5155,5517,5745,6127,6367,6769,7021,7443,7707,8149,8425
%N Coordination sequence for the Manhattan cubic lattice.
%C In the Manhattan cubic lattice, streets parallel to one of the 3 axis have alternating orientations:
%C .---->----.
%C /| /|
%C v | ^ |
%C / v / ^
%C .----<----. |
%C | | | |
%C | .----<|---.
%C ^ / v /
%C | ^ | v
%C |/ |/
%C O---->----.
%H Rémy Sigrist, <a href="/A354961/a354961.png">Illustration of initial terms</a>
%H Rémy Sigrist, <a href="/A354961/a354961.txt">C# program</a>
%H <a href="/index/Con#coordination_sequences">Index entries for coordination sequences</a>
%o (C#) See Links section.
%Y Cf. A005899, A336627 A354957.
%K nonn
%O 0,2
%A _Rémy Sigrist_, Jun 13 2022