Number of one-sided polyquarcs with n cells.

Terms

a(0) =1a(1) =3a(2) =6a(3) =23a(4) =70a(5) =272a(6) =1021a(7) =4087a(8) =16235a(9) =66064a(10) =270261a(11) =1117807a(12) =4647900a(13) =19449879a(14) =81771427a(15) =345328750a(16) =1463772282a(17) =6225670768a(18) =26557822342