a(n) is the number of permutable pieces in a standard n X n X n Rubik's cube.

Terms

a(0) =0a(1) =8a(2) =20a(3) =56a(4) =92a(5) =152a(6) =212a(7) =296a(8) =380a(9) =488a(10) =596a(11) =728a(12) =860a(13) =1016a(14) =1172a(15) =1352a(16) =1532a(17) =1736a(18) =1940a(19) =2168a(20) =2396a(21) =2648a(22) =2900a(23) =3176a(24) =3452a(25) =3752a(26) =4052a(27) =4376a(28) =4700a(29) =5048