Number of tilings of a 2 X n rectangle using monominoes and trominoes of any shape.

A270062

Number of tilings of a 2 X n rectangle using monominoes and trominoes of any shape.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =14a(4) =45a(5) =140a(6) =438a(7) =1371a(8) =4287a(9) =13413a(10) =41956a(11) =131249a(12) =410572a(13) =1284352a(14) =4017713a(15) =12568213a(16) =39315905a(17) =122988066a(18) =384731445a(19) =1203517448a(20) =3764844982a(21) =11777193395a(22) =36841433019a(23) =115247422841a(24) =360517151000

External references