a(n) = Sum_{i=0..n} Sum_{j=0..n} (i XOR j), where XOR is the binary logical exclusive-or operator.

Terms

a(0) =0a(1) =2a(2) =12a(3) =24a(4) =68a(5) =114a(6) =168a(7) =224a(8) =408a(9) =594a(10) =788a(11) =984a(12) =1212a(13) =1442a(14) =1680a(15) =1920a(16) =2672a(17) =3426a(18) =4188a(19) =4952a(20) =5748a(21) =6546a(22) =7352a(23) =8160a(24) =9096a(25) =10034a(26) =10980a(27) =11928a(28) =12908a(29) =13890