Number of ways to arrange 6 nonattacking triangular rooks on an n X n X n triangular grid.

A193984

Number of ways to arrange 6 nonattacking triangular rooks on an n X n X n triangular grid.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =166a(9) =4902a(10) =54771a(11) =382439a(12) =1976455a(13) =8250687a(14) =29309540a(15) =91705972a(16) =258870740a(17) =671005444a(18) =1618468198a(19) =3670491998a(20) =7891420850a(21) =16191666766a(22) =31878943876a(23) =60501909500a(24) =111108316262a(25) =198083991586a(26) =343784805209

External references