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A097076 Expansion of x/(1-x-3x^2-x^3). +0
9
0, 1, 1, 4, 8, 21, 49, 120, 288, 697, 1681, 4060, 9800, 23661, 57121, 137904, 332928, 803761, 1940449, 4684660, 11309768, 27304197, 65918161, 159140520, 384199200, 927538921, 2239277041, 5406093004, 13051463048, 31509019101, 76069501249 (list; graph; listen)
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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