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A105872
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a(n)=sum{k=0..floor(n/2), C(2n-3k, n)}.
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1
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1, 2, 6, 21, 75, 273, 1009, 3770, 14202, 53846, 205216, 785460, 3017106, 11624580, 44905518, 173863965, 674506059, 2621371005, 10203609597, 39773263035, 155231706951, 606554343495, 2372544034143, 9289131196485, 36401388236461
(list; graph; refs; listen; history; internal format)
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