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A135755
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a(n) = Sum_{k=0..n} C(n,k)*3^[k*(k-1)/2].
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1
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1, 2, 6, 40, 860, 63000, 14714728, 10562062112, 22960880409360, 150300904214651680, 2955814683617734854752, 174481716707875308905153664, 30905247968182392588500030233024
(list; graph; refs; listen; history; internal format)
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