Consider a 3 X 3 X 3 Rubik cube, but only allow the moves M_R, D; sequence gives number of positions that are exactly n moves from the start.

A080617

Consider a 3 X 3 X 3 Rubik cube, but only allow the moves M_R, D; sequence gives number of positions that are exactly n moves from the start.

Terms

    a(0) =1a(1) =4a(2) =10a(3) =24a(4) =58a(5) =140a(6) =338a(7) =816a(8) =1909a(9) =4296a(10) =8893a(11) =17160a(12) =28891a(13) =37996a(14) =37678a(15) =27186a(16) =13051a(17) =4128a(18) =1199a(19) =372a(20) =122a(21) =36a(22) =10a(23) =2

External references