Number of connected dominating sets in the n-ladder graph.

Terms

a(0) =3a(1) =9a(2) =24a(3) =56a(4) =136a(5) =328a(6) =792a(7) =1912a(8) =4616a(9) =11144a(10) =26904a(11) =64952a(12) =156808a(13) =378568a(14) =913944a(15) =2206456a(16) =5326856a(17) =12860168a(18) =31047192a(19) =74954552a(20) =180956296a(21) =436867144a(22) =1054690584a(23) =2546248312a(24) =6147187208a(25) =14840622728a(26) =35828432664a(27) =86497488056a(28) =208823408776a(29) =504144305608