Column 4 of A048790.

Terms

a(0) =0a(1) =4a(2) =76a(3) =344a(4) =936a(5) =1980a(6) =3604a(7) =5936a(8) =9104a(9) =13236a(10) =18460a(11) =24904a(12) =32696a(13) =41964a(14) =52836a(15) =65440a(16) =79904a(17) =96356a(18) =114924a(19) =135736a(20) =158920a(21) =184604a(22) =212916a(23) =243984a(24) =277936a(25) =314900a(26) =355004a(27) =398376a(28) =445144a(29) =495436