Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape U; triangle T(n,k), n>=0, read by rows.
A247708
Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape U; triangle T(n,k), n>=0, read by rows.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =39a(4) =16a(5) =1a(6) =369a(7) =120a(8) =12a(9) =2908a(10) =1000a(11) =98a(12) =19185a(13) =7474a(14) =1228a(15) =60a(16) =3a(17) =137200a(18) =63896a(19) =12448a(20) =1092a(21) =53a(22) =1022915a(23) =540562a(24) =120034a(25) =12676a(26) =590a(27) =4a(28) =7606043a(29) =4365686
External references
- oeis: A247708