%I #35 Sep 23 2021 06:43:33
%S 2,2,4,5,6,8,10,12,15,17,20,23,26,30,33,36,40,45,49,54,58,63,69,74
%N Total domination number of the n-triangular grid graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/TotalDominationNumber.html">Total Domination Number</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/TriangularGridGraph.html">Triangular Grid Graph</a>
%F a(n) ~ n^2/10. - _Andrew Howroyd_, May 20 2018
%Y Cf. A251419, A303049.
%K nonn,more
%O 1,1
%A _Eric W. Weisstein_, Apr 08 2018
%E a(11)-a(15) from _Andrew Howroyd_, Apr 18 2018
%E a(16)-a(17) from _Eric W. Weisstein_, Apr 18 2018
%E a(18) from _Eric W. Weisstein_, Apr 20 2018
%E a(19) from _Andrew Howroyd_, May 19 2018
%E a(20)-a(24) from _Eric W. Weisstein_, Sep 22-23 2021