<ul><li>Trinomial coefficients are a generalization of binomial coefficients to three variables.</li><li>Another use of trinomial coefficients is the coefficients of x^k in the expansion of (1 + x + 1/x)^n.</li><li>Trinomial coefficients can be visualized in a triangle analogous to Pascal’s triangle, where each entry is the sum of the three entries above it.</li><li>Trinomial coefficients relate to the moves of a king on a chessboard, representing the number of paths a king can take to a square using the minimal number of moves.</li></ul>

Trinomial Coefficients and Kings

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