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    Entringer Number

    Entringer number

    EntringerNumber(n, k) = e(n, k) for (n element Z and n>=0 and k element Z and k>=0 and EntringerNumber(0, 0) = 1 and EntringerNumber(n, 0) = 0 and EntringerNumber(n, k) = EntringerNumber(n, k - 1) + EntringerNumber(n - 1, n - k) and EntringerNumber(n, n) = n! [(z - 0)^n](sec(z) + tan(z)) and EntringerNumber(1, 1) = 1 and EntringerNumber(2, 1) = 1 and EntringerNumber(2, 2) = 1 and EntringerNumber(3, 1) = 1 and EntringerNumber(3, 2) = 2 and EntringerNumber(3, 3) = 2 and EntringerNumber(4, 1) = 2 and EntringerNumber(4, 2) = 4 and EntringerNumber(4, 3) = 5 and EntringerNumber(4, 4) = 5 and ...)

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