a(n) = A059784(n+1) - A059784(n)^2.

Terms

a(0) =1a(1) =4a(2) =12a(3) =4a(4) =22a(5) =12a(6) =114a(7) =4a(8) =138a(9) =142a(10) =2956a(11) =6388a(12) =5248a(13) =17532a(14) =96930a(15) =83782a(16) =1464a(17) =897448a(18) =300832a(19) =26908