See OEIS A129818 and the unsigned version A085478 as well as A049310, A011973, and A054142.
Relations among the Gegenbauer, Jacobi, Legendre, and the polynomials highlighted in this post can be found in OEIS A097610 via A011973 and A049310.
A102426, A030528, A011973, A049310 contain relations to the Pascal, Fibonacci, Chebyshev, and other polynomials.