Sort then Add, a(1)=20.

Terms

a(0) =20a(1) =22a(2) =44a(3) =88a(4) =176a(5) =343a(6) =677a(7) =1354a(8) =2699a(9) =5398a(10) =8987a(11) =16876a(12) =33554a(13) =67009a(14) =67688a(15) =134476a(16) =268943a(17) =503632a(18) =526988a(19) =783877a(20) =1161665a(21) =2277331a(22) =3500708a(23) =3504286a(24) =3738854a(25) =7084642a(26) =7329320a(27) =7552699a(28) =10109498a(29) =10224397