Number of 3 X 3 X 3 X 3 magic cubes with magic sum 3n.

Terms

a(0) =1a(1) =153a(2) =6297a(3) =82161a(4) =582377a(5) =2823169a(6) =10577681a(7) =32908425a(8) =88984025a(9) =215645185a(10) =478631121a(11) =988480025a(12) =1922282689a(13) =3552547017a(14) =6284626217a(15) =10704205425a(16) =17636581137a(17) =28219457161a(18) =43991281193a(19) =66997065953a(20) =99914018553a(21) =146199131313a(22) =210261368801a(23) =297660801977