Row sums of a Chebyshev number triangle.

Terms

a(0) =1a(1) =3a(2) =6a(3) =14a(4) =40a(5) =131a(6) =471a(7) =1829a(8) =7620a(9) =33902a(10) =160362a(11) =803065a(12) =4241457a(13) =23546969a(14) =137002658a(15) =833225728a(16) =5284731576a(17) =34881786097a(18) =239147833907