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A103872
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3Trinomial[n+1,0]-Trinomial[n+2,0].
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0
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0, 2, 2, 6, 12, 30, 72, 182, 464, 1206, 3170, 8426, 22596, 61074, 166194, 454950, 1251984, 3461574, 9611190, 26787378, 74916660, 210178458, 591347988, 1668172842, 4717282752, 13369522250, 37970114702, 108045430902
(list; graph; refs; listen; history; internal format)
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