Number of n X n rook placements avoiding the pattern 012.
A221957
Number of n X n rook placements avoiding the pattern 012.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =31a(4) =159a(5) =921a(6) =5988a(7) =43632a(8) =355491a(9) =3223729a(10) =32329668a(11) =355979064a(12) =4273100846a(13) =55555511298a(14) =777797216472
External references
- oeis: A221957