From fundamental unit of Z[ (-n)^{1/4} ].

Terms

a(0) =1a(1) =0a(2) =-2a(3) =2a(4) =4a(5) =-26a(6) =2a(7) =198a(8) =12a(9) =96a(10) =-14a(11) =28a(12) =2a(13) =4a(14) =-204a(15) =7a(16) =58332a(17) =11821890a(18) =6a(19) =36a(20) =440140a(21) =-8909082a(22) =46a(23) =1405a(24) =12a(25) =220224a(26) =2a(27) =-411912a(28) =57396a(29) =28184