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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =4a(7) =5a(8) =5a(9) =1a(10) =16a(11) =29a(12) =25a(13) =5a(14) =1a(15) =100a(16) =213a(17) =183a(18) =54a(19) =9a(20) =1a(21) =625a(22) =1545a(23) =1395a(24) =502a(25) =99a(26) =9a(27) =1a(28) =4300a(29) =11431