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A055518
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a_{k+1} = 6*a_k + 11*a_{k-1} - 19*a_{k-2} - 4*a_{k-3} + a_{k-4}, a_1=1, a_2=2, a_3=19, a_4=118, a_5=875.
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3
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1, 2, 19, 118, 875, 6180, 44389, 317236, 2270893, 16247718, 116267271, 831957002, 5953209015, 42598982984, 304823192665, 2181205436792, 15607926184313, 111684733527034, 799175992102923, 5718617425358462, 40920380028968819
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