References to A135929

Triangle read by rows: row n gives coefficients of polynomial P_n(x)= U_n(X,1) + 3 * U_{n-2}(X,1) where U is the Chebyshev polynomial of the second kind, in order of decreasing exponents
1, 1, 0, 1, 0, 2, 1, 0, 1, 0, 1, 0, 0, 0, 2, 1, 0, 1, 0, 3, 0, 1, 0, 2, 0, 3, 0, 2, 1, 0, 3

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