Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape T; triangle T(n,k), n>=0, 0<=k<=max(0,floor(2*(n-1)/3)), read by rows.

A247707

Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape T; triangle T(n,k), n>=0, 0<=k<=max(0,floor(2*(n-1)/3)), read by rows.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =50a(4) =6a(5) =437a(6) =62a(7) =2a(8) =3270a(9) =700a(10) =36a(11) =21720a(12) =5712a(13) =506a(14) =12a(15) =160593a(16) =48364a(17) =5444a(18) =282a(19) =6a(20) =1209537a(21) =425638a(22) =57648a(23) =3836a(24) =122a(25) =8999307a(26) =3578302a(27) =576791a(28) =48688a(29) =2226

External references