a(n) is the optimal wire-length for an n X n grid.

Terms

a(0) =0a(1) =6a(2) =24a(3) =60a(4) =116a(5) =200a(6) =318a(7) =472a(8) =668a(9) =914a(10) =1214a(11) =1568a(12) =1988a(13) =2480a(14) =3040a(15) =3680a(16) =4408a(17) =5224a(18) =6130a(19) =7140a(20) =8260a(21) =9478a(22) =10816a(23) =12280a(24) =13864a(25) =15576a(26) =17430a(27) =19428a(28) =21560a(29) =23850