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A122050
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An n-th level recursion:a(n) = (n-1)a(n - 1) - a(n - 4).
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0
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0, 1, 2, 1, 3, 11, 53, 317, 2216, 17717, 159400, 1593683, 17528297, 210321847, 2734024611, 38274750871, 574103734768, 9185449434441, 156149906360886, 2810660039745077, 53401966651421695, 1068030147578999459
(list; graph; refs; listen; history; internal format)
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