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A123871
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G.f.: (1+x+x^2)/(1-4*x-4*x^2).
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0
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1, 5, 25, 120, 580, 2800, 13520, 65280, 315200, 1521920, 7348480, 35481600, 171320320, 827207680, 3994112000, 19285278720, 93117562880, 449611366400, 2170915717120, 10482108334080, 50612096204800, 244376818155520, 1179955657441280, 5697329902387200
(list; graph; refs; listen; history; internal format)
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