Triangle read by rows: numbers of isomers of unbranched a-4-catapolynonagons.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =4a(8) =4a(9) =1a(10) =12a(11) =21a(12) =19a(13) =4a(14) =1a(15) =63a(16) =138a(17) =123a(18) =40a(19) =7a(20) =1a(21) =342a(22) =864a(23) =834a(24) =330a(25) =73a(26) =7a(27) =1a(28) =1998a(29) =5526