Triangle read by rows, T(n,k) = 2^k*GegenbauerC(k,-n,-1/4), for n>=0 and 0<=k<=n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =9a(6) =1a(7) =3a(8) =15a(9) =25a(10) =1a(11) =4a(12) =22a(13) =52a(14) =145a(15) =1a(16) =5a(17) =30a(18) =90a(19) =285a(20) =561a(21) =1a(22) =6a(23) =39a(24) =140a(25) =495a(26) =1206a(27) =2841a(28) =1a(29) =7