Number of self-avoiding walks on a honeycomb lattice with a one-dimensional impenetrable boundary.

Terms

a(0) =3a(1) =4a(2) =8a(3) =14a(4) =28a(5) =46a(6) =90a(7) =160a(8) =308a(9) =540a(10) =1032a(11) =1846a(12) =3502a(13) =6272a(14) =11852a(15) =21364a(16) =40234a(17) =72694a(18) =136564a(19) =247498a(20) =464070a(21) =842546a(22) =1577280a(23) =2868922a(24) =5364030a(25) =9769366a(26) =18245976a(27) =33272104a(28) =62086194a(29) =113326264