Bond percolation series for hexagonal net.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =4a(6) =8a(7) =7a(8) =15a(9) =12a(10) =28a(11) =18a(12) =52a(13) =26a(14) =97a(15) =28a(16) =185a(17) =14a(18) =360a(19) =-66a(20) =723a(21) =-308a(22) =1497a(23) =-1012a(24) =3202a(25) =-2838a(26) =7048a(27) =-7538a(28) =15883a(29) =-19209