Number of dissections of an n-gon into 3- and 4-gons counted up to rotations and reflections.
A290646
Number of dissections of an n-gon into 3- and 4-gons counted up to rotations and reflections.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =7a(4) =14a(5) =53a(6) =171a(7) =691a(8) =2738a(9) =11720a(10) =50486a(11) =224012a(12) =1005468a(13) =4581815a(14) =21093190a(15) =98093226a(16) =459986674a(17) =2173599817a(18) =10340539744a(19) =49496519950a(20) =238240366274
External references
- oeis: A290646