a(n) = 2*n*A071148(n).

Terms

a(0) =6a(1) =32a(2) =90a(3) =208a(4) =390a(5) =672a(6) =1050a(7) =1568a(8) =2286a(9) =3160a(10) =4290a(11) =5664a(12) =7254a(13) =9128a(14) =11370a(15) =14016a(16) =16966a(17) =20376a(18) =24206a(19) =28400a(20) =33138a(21) =38368a(22) =44206a(23) =50784a(24) =57950a(25) =65624a(26) =73926a(27) =82768a(28) =92278a(29) =103080