Number of compositions c of n such that no three points (i,c_i), (j,c_j), (k,c_k) are collinear, where c_i denotes the i-th part.
A238686
Number of compositions c of n such that no three points (i,c_i), (j,c_j), (k,c_k) are collinear, where c_i denotes the i-th part.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =11a(6) =19a(7) =30a(8) =53a(9) =87a(10) =148a(11) =219a(12) =365a(13) =555a(14) =884a(15) =1379a(16) =2098a(17) =3152a(18) =4865a(19) =7051a(20) =10884a(21) =15681a(22) =23637a(23) =34062a(24) =50336a(25) =72425a(26) =105738a(27) =149781a(28) =217625a(29) =308859
External references
- oeis: A238686