Number of convex polyominoes with a 3 X n+1 minimal bounding rectangle.

Terms

a(0) =13a(1) =68a(2) =222a(3) =555a(4) =1171a(5) =2198a(6) =3788a(7) =6117a(8) =9385a(9) =13816a(10) =19658a(11) =27183a(12) =36687a(13) =48490a(14) =62936a(15) =80393a(16) =101253a(17) =125932a(18) =154870a(19) =188531a(20) =227403a(21) =271998a(22) =322852a(23) =380525a(24) =445601a(25) =518688a(26) =600418a(27) =691447a(28) =792455a(29) =904146