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A165902
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a(0)=0, a(1)=1, a(n-1)+3^(n-3)*a(n-2)
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0
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0, 1, 1, 2, 5, 23, 158, 2021, 40415, 1513724, 89901329, 10021444493, 1779549303200, 593535825170357, 315835356239140757, 315745107820598835194, 503859317773076207957705, 1510702921925354866376968691
(list; graph; refs; listen; history; internal format)
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