Triangle T(n, k) = (k*ChebyshevU(n, (k+2)/2) + 2*ChebyshevT(n+1, (k+2)/2))/2.

Terms

a(0) =5a(1) =13a(2) =41a(3) =34a(4) =153a(5) =436a(6) =89a(7) =571a(8) =2089a(9) =5741a(10) =233a(11) =2131a(12) =10009a(13) =33461a(14) =90481a(15) =610a(16) =7953a(17) =47956a(18) =195025a(19) =620166a(20) =1663585a(21) =1597a(22) =29681a(23) =229771a(24) =1136689a(25) =4250681a(26) =13097377a(27) =34988311a(28) =4181a(29) =110771