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%I #7 Jun 15 2022 11:36:49
%S 1,3,7,14,21,25,35,35,49,45,63,55,77,65,91,75,105,85,119,95,133,105,
%T 147,115,161,125,175,135,189,145,203,155,217,165,231,175,245,185,259,
%U 195,273,205,287,215,301,225,315,235,329,245,343,255,357,265,371,275
%N Coordination sequence for the Manhattan hexagonal lattice with respect to the origin.
%C In the Manhattan hexagonal lattice, streets parallel to one of the 3 axis have alternating orientations:
%C Z Y
%C .---<---.
%C / \ / \
%C v ^ ^ v
%C / \ / \
%C .--->---O--->---. X
%C \ / \ /
%C v ^ ^ v
%C \ / \ /
%C .---<---.
%H Rémy Sigrist, <a href="/A354957/a354957.png">Illustration of initial terms</a>
%H Rémy Sigrist, <a href="/A354957/a354957.gp.txt">PARI program</a>
%H <a href="/index/Con#coordination_sequences">Index entries for coordination sequences</a>
%H <a href="/index/Aa#A2">Index entries for sequences related to A2 = hexagonal = triangular lattice</a>
%o (PARI) See Links section.
%Y Cf. A008458, A336627, A354958.
%K nonn
%O 0,2
%A _Rémy Sigrist_, Jun 13 2022
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