a(n) = Sum_{k=1..n-1} (k AND n-k).

Terms

a(0) =1a(1) =0a(2) =4a(3) =4a(4) =5a(5) =0a(6) =12a(7) =16a(8) =21a(9) =16a(10) =24a(11) =20a(12) =17a(13) =0a(14) =32a(15) =48a(16) =65a(17) =64a(18) =84a(19) =84a(20) =85a(21) =64a(22) =92a(23) =96a(24) =101a(25) =80a(26) =88a(27) =68a(28) =49a(29) =0