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A027412
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a(n) = 2*a(n-1) + (n-2)*a(n-2).
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1
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1, 2, 4, 10, 28, 86, 284, 998, 3700, 14386, 58372, 246218, 1076156, 4860710, 22635292, 108459814, 533813716, 2694524642, 13930068740, 73667056394, 398075350108, 2195824771702, 12353156545564, 70818633296870
(list; graph; refs; listen; history; internal format)
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