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A055790 a(n) = n*a(n-1) + (n-2)*a(n-2) [a(0) = 0, a(1) = 2]. +0
18
0, 2, 4, 14, 64, 362, 2428, 18806, 165016, 1616786, 17487988, 206918942, 2657907184, 36828901754, 547499510764, 8691268384262, 146725287298888, 2624698909845026, 49592184973992676, 986871395973226286, 20630087248996393888, 451982388752415571082 (list; graph; listen)
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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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