Erroneous version of A032522.

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =2a(5) =4a(6) =8a(7) =4a(8) =16a(9) =12a(10) =48a(11) =80a(12) =136a(13) =420a(14) =1240a(15) =2872a(16) =7652a(17) =18104a(18) =50184