Triangle giving number of unbranched catapolytetragons, read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =3a(9) =2a(10) =1a(11) =3a(12) =9a(13) =7a(14) =4a(15) =1a(16) =5a(17) =16a(18) =29a(19) =23a(20) =10a(21) =1a(22) =5a(23) =27a(24) =62a(25) =99a(26) =69a(27) =25a(28) =1a(29) =7