Number of directed site animals on hexagonal lattice.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =11a(5) =21a(6) =40a(7) =77a(8) =149a(9) =289a(10) =563a(11) =1099a(12) =2152a(13) =4222a(14) =8299a(15) =16339a(16) =32217a(17) =63612a(18) =125753a(19) =248870a(20) =493015a(21) =977576a(22) =1940042a(23) =3853117a(24) =7658211a(25) =15231219a(26) =30312012a(27) =60360046a(28) =120260317