Number of one-sided polybends with n cells.

Terms

a(0) =1a(1) =3a(2) =4a(3) =10a(4) =13a(5) =28a(6) =44a(7) =85a(8) =139a(9) =263a(10) =450a(11) =815a(12) =1403a(13) =2540a(14) =4447a(15) =7868a(16) =13769a(17) =24500a(18) =43106a(19) =75685a(20) =132865a(21) =234600a(22) =412731a(23) =722450a(24) =1267901a(25) =2230016a(26) =3917654a(27) =6847502a(28) =12004150a(29) =21063678