Duplicate of A038521.

Terms

a(0) =0a(1) =0a(2) =2a(3) =1a(4) =4a(5) =10a(6) =12a(7) =36a(8) =64a(9) =120a(10) =272a(11) =496a(12) =1024a(13) =2080a(14) =4032a(15) =8256a(16) =16384a(17) =32640a(18) =65792a(19) =130816a(20) =262144a(21) =524800a(22) =1047552a(23) =2098176a(24) =4194304