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A099171
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Generalized Motzkin paths with no hills and 4-horizontal steps (even coefficients).
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1
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0, 2, 3, 12, 37, 132, 473, 1753, 6612, 25355, 98492, 386812, 1533269, 6126254, 24647539, 99766315, 405994556, 1660072482, 6816932349, 28101049860, 116243913509, 482387204447, 2007615713528, 8377621010483, 35044880237710
(list; graph; refs; listen; history; internal format)
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