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%I #6 Aug 03 2020 03:42:20
%S 1,3,7,13,25,47,89,169,321,599,1125,2097,3925,7317,13667,25389,47313,
%T 87781,163265,302617,562023,1040465,1929879,3569627,6613725,12223777,
%U 22626357,41790173,77289525,142665435,263661315,486420171,898372311,1656580751,3057774587,5636030345
%N Number of n-step self-avoiding walks on the half-Manhattan lattice with no non-contiguous adjacencies.
%C In the half-Manhattan lattice, E-W streets run alternately E and W, but N-S streets are two way.
%Y Cf. A336724 (self-avoiding walks), A336662 (Manhattan lattice), A173380 (square lattice).
%K nonn,walk
%O 0,2
%A _Sean A. Irvine_, Aug 02 2020