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A138574
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a(0)=0,a(1)=1,a(2)=2,a(3)=6 then a(n+4)=2a(n+3)+2a(n+2)+2a(n+1)-a(n).
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0
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0, 1, 2, 6, 15, 45, 130, 376, 1088, 3145, 9089, 26270, 75920, 219412, 634115, 1832625, 5296384, 15306834, 44237569, 127848949, 369490321, 1067846844, 3086134658, 8919094697, 25776662079, 74495936026, 215297250946, 622220603404
(list; graph; refs; listen; history; internal format)
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