First differences of A138383.

Terms

a(0) =0a(1) =6a(2) =4a(3) =25a(4) =-13a(5) =37a(6) =-25a(7) =49a(8) =73a(9) =-98a(10) =146a(11) =-49a(12) =-73a(13) =97a(14) =121a(15) =36a(16) =-218a(17) =266a(18) =-109a(19) =-133a(20) =314a(21) =-133a(22) =193a(23) =229a(24) =-350a(25) =-193a(26) =217a(27) =-205a(28) =229a(29) =1241