Imaginary parts of b(n) sequence used to define A143056.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =6a(6) =7a(7) =4a(8) =-8a(9) =-36a(10) =-87a(11) =-162a(12) =-244a(13) =-278a(14) =-145a(15) =360a(16) =1520a(17) =3608a(18) =6641a(19) =9882a(20) =11028a(21) =5166a(22) =-16073a(23) =-64084a(24) =-149528a(25) =-272076a(26) =-399911a(27) =-436682a(28) =-179684a(29) =712530