Number of minimal total dominating sets in the n-barbell graph.

Terms

a(0) =1a(1) =1a(2) =6a(3) =28a(4) =85a(5) =201a(6) =406a(7) =736a(8) =1233a(9) =1945a(10) =2926a(11) =4236a(12) =5941a(13) =8113a(14) =10830a(15) =14176a(16) =18241a(17) =23121a(18) =28918a(19) =35740a(20) =43701a(21) =52921a(22) =63526a(23) =75648a(24) =89425a(25) =105001a(26) =122526a(27) =142156a(28) =164053a(29) =188385