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A084900
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3^(n-2)n(5n+1)/2.
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2
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0, 1, 11, 72, 378, 1755, 7533, 30618, 119556, 452709, 1673055, 6062364, 21611934, 75996063, 264126177, 908764110, 3099363912, 10489051017, 35255264499, 117775828656, 391294693890, 1293597012771, 4257363753621, 13954111172802
(list; graph; refs; listen; history; internal format)
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