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%I #12 Jun 03 2020 05:27:11
%S 8,172,1864,9396,28188,72688,153240,269680,500344,795344,1158752,
%T 1820428,2506948,3477052,4772708,6313892,8116916,10200156,13320308,
%U 16199876,20189488,24692976,28950448,36096712,41795388,49216724,58997920
%N Number of edges in an diagonal-edged (or diamond-shaped) checkerboard with width and height 2*n-1 (see Comments in A333434 for definition).
%C See A333434 for the definition and images of the checkerboard.
%Y Cf. A333434 (regions), A333458 (n-gons), A333459 (vertices), A333027, A333036, A333283.
%K nonn,more
%O 1,1
%A _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 22 2020
%E a(8)-a(27) from _Lars Blomberg_, Jun 03 2020
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