Number of 1-sided strip polyiamonds with n cells.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =9a(6) =13a(7) =28a(8) =44a(9) =88a(10) =149a(11) =283a(12) =494a(13) =920a(14) =1633a(15) =3004a(16) =5382a(17) =9814a(18) =17660a(19) =32058a(20) =57809a(21) =104630a(22) =188800a(23) =341027a(24) =615401a(25) =1110062a(26) =2002521a(27) =3608523a(28) =6506635a(29) =11715740