Number of edges in the hyperoctahedral (or cocktail party) graph of order n.

Terms

a(0) =0a(1) =6a(2) =34a(3) =112a(4) =336a(5) =652a(6) =1530a(7) =2752a(8) =3952a(9) =7606a(10) =11794a(11) =15096a(12) =24720a(13) =33998a(14) =36154a(15) =60928a(16) =79616a(17) =94660a(18) =128514a(19) =159600a(20) =174868a(21) =239806a(22) =290394a(23) =329568a(24) =413376a(25) =486934a(26) =547126a(27) =665392a(28) =772240a(29) =821076