a(n) = 2*n*A259319(n) - A259110(n)^2.

Terms

a(0) =0a(1) =256a(2) =3584a(3) =21504a(4) =84480a(5) =256256a(6) =652288a(7) =1462272a(8) =2976768a(9) =5617920a(10) =9974272a(11) =16839680a(12) =27256320a(13) =42561792a(14) =64440320a(15) =94978048a(16) =136722432a(17) =192745728a(18) =266712576a(19) =362951680a(20) =486531584a(21) =643340544a(22) =840170496a(23) =1084805120a(24) =1386112000a(25) =1754138880a(26) =2200214016