Minimal perimeter of polyomino with n square cells.

Terms

a(0) =0a(1) =4a(2) =6a(3) =8a(4) =8a(5) =10a(6) =10a(7) =12a(8) =12a(9) =12a(10) =14a(11) =14a(12) =14a(13) =16a(14) =16a(15) =16a(16) =16a(17) =18a(18) =18a(19) =18a(20) =18a(21) =20a(22) =20a(23) =20a(24) =20a(25) =20a(26) =22a(27) =22a(28) =22a(29) =22