Number of total dominating sets in the (2n-1)-triangular snake (for n > 1).

Terms

a(0) =1a(1) =4a(2) =16a(3) =46a(4) =148a(5) =466a(6) =1468a(7) =4630a(8) =14596a(9) =46018a(10) =145084a(11) =457414a(12) =1442116a(13) =4546642a(14) =14334460a(15) =45193078a(16) =142482820a(17) =449213794a(18) =1416262204a(19) =4465131430a(20) =14077477060a(21) =44382872818a(22) =139928439676a(23) =441160451926