Number of n X n rook placements avoiding the pattern 102.
A221958
Number of n X n rook placements avoiding the pattern 102.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =31a(4) =159a(5) =916a(6) =5859a(7) =41462a(8) =324539a(9) =2810398a(10) =26897153a(11) =283648795a(12) =3280219609a(13) =41351673884a(14) =564705224247
External references
- oeis: A221958