Triangle, T(n, k) = (sqrt(k+1))^(n-1)*ChebyshevU(n-1, sqrt(k+1)/2), read by rows.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =0a(7) =2a(8) =6a(9) =12a(10) =-1a(11) =0a(12) =9a(13) =32a(14) =75a(15) =-1a(16) =-4a(17) =9a(18) =80a(19) =275a(20) =684a(21) =0a(22) =-8a(23) =0a(24) =192a(25) =1000a(26) =3240a(27) =8232a(28) =1a(29) =-8