%I #12 Feb 16 2025 08:34:06
%S 0,6,34,112,336,652,1530,2752,3952,7606,11794,15096,24720,33998,36154,
%T 60928,79616,94660,128514,159600,174868,239806,290394,329568,413376,
%U 486934,547126,665392,772240,821076,1021194,1164800,1280636,1500358,1694690,1863288,2135376,2383518,2592154
%N Number of edges in the hyperoctahedral (or cocktail party) graph of order n.
%C See A368755 and A368756 for images of the graphs.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CocktailPartyGraph.html">Cocktail Party Graph</a>.
%F a(n) = A368755(n) + A368756(n) - 1 by Euler's formula.
%Y Cf. A368755 (regions), A368756 (vertices), A368758 (k-gons), A129348, A193130, A282010.
%K nonn,changed
%O 1,2
%A _Scott R. Shannon_, Jan 04 2024