Difference between 4*A001590(n+2) and A075092(n).

Terms

a(0) =-6a(1) =4a(2) =6a(3) =0a(4) =18a(5) =24a(6) =30a(7) =92a(8) =138a(9) =236a(10) =518a(11) =856a(12) =1570a(13) =3072a(14) =5374a(15) =9972a(16) =18714a(17) =33684a(18) =62406a(19) =115440a(20) =210482a(21) =388776a(22) =715934a(23) =1312460a(24) =2419114a(25) =4449532a(26) =8174406a(27) =15049672a(28) =27675714a(29) =50884368