Sequence is {a(2,n)}, where a(m,n) is defined at sequence A111518.

Terms

a(0) =1a(1) =2a(2) =0a(3) =-6a(4) =-5a(5) =7a(6) =-43a(7) =-107a(8) =410a(9) =-308a(10) =-5201a(11) =22426a(12) =1694a(13) =-462663a(14) =2209642a(15) =47303a(16) =-62434277a(17) =381876639a(18) =-384111618a(19) =-11477555984a(20) =100411394912a(21) =-284526009121