Number of little cubes visible around an n X n X n cube with a face on a table.

Terms

a(0) =1a(1) =8a(2) =25a(3) =52a(4) =89a(5) =136a(6) =193a(7) =260a(8) =337a(9) =424a(10) =521a(11) =628a(12) =745a(13) =872a(14) =1009a(15) =1156a(16) =1313a(17) =1480a(18) =1657a(19) =1844a(20) =2041a(21) =2248a(22) =2465a(23) =2692a(24) =2929a(25) =3176a(26) =3433a(27) =3700a(28) =3977a(29) =4264