References to A008287

Triangle of quadrinomial coefficients, row n is the sequence of coefficients of (1+x+x^2+x^3)^n
1, 1, 1, 1, 1, 1, 2, 3, 4, 3, 2, 1, 1, 3, 6, 10, 12, 12, 10, 6, 3, 1, 1, 4, 10, 20, 31, 40, 44

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