a(n) = A273059(4n).

Terms

a(0) =0a(1) =21a(2) =112a(3) =276a(4) =511a(5) =708a(6) =1063a(7) =1491a(8) =1990a(9) =2561a(10) =3205a(11) =3920a(12) =4437a(13) =5272a(14) =6180a(15) =7159a(16) =8211a(17) =9334a(18) =10123a(19) =11366a(20) =12682a(21) =14069a(22) =15528a(23) =17060a(24) =18663a(25) =19772a(26) =21495a(27) =23291a(28) =25158a(29) =26443