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A165205
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a(n)=C(2n-1,n)+C(2n+1,n+1)-C(0,n).
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1
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1, 4, 13, 45, 161, 588, 2178, 8151, 30745, 116688, 445094, 1704794, 6552378, 25258600, 97617060, 378098955, 1467343305, 5704370760, 22210199550, 86595896310, 338052201630, 1321178419080, 5168764845660, 20240517205350
(list; graph; refs; listen; history; internal format)
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