a(n) = Pell(n)*A109064(n) for n >= 1 with a(0)=1.

Terms

a(0) =1a(1) =-5a(2) =10a(3) =50a(4) =-180a(5) =-145a(6) =-700a(7) =5070a(8) =10200a(9) =-34475a(10) =11890a(11) =-344460a(12) =415800a(13) =2007660a(14) =-2423460a(15) =1950250a(16) =-25895760a(17) =90935120a(18) =96047350a(19) =-662510900a(20) =-239916420a(21) =-2316837900a(22) =5593341480a(23) =24756454910a(24) =-27166986000a(25) =-6558690605a(26) =-190008957720a(27) =764537004500