Even elements of A082931.

Terms

a(0) =2a(1) =8a(2) =14a(3) =20a(4) =24a(5) =48a(6) =90a(7) =118a(8) =212a(9) =296a(10) =320a(11) =368a(12) =410a(13) =422a(14) =468a(15) =530a(16) =674a(17) =722a(18) =812a(19) =848a(20) =920a(21) =1262a(22) =1328a(23) =1940a(24) =2162a(25) =2252a(26) =2486a(27) =3362a(28) =3380a(29) =3956