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A159036
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a(0)=0, a(1)=1, a(2)=4, a(3)=13; thereafter a(n+3)=4*a(n+2)-4*a(n+1)+2*a(n) for n>=1.
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1
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0, 1, 4, 13, 38, 108, 306, 868, 2464, 6996, 19864, 56400, 160136, 454672, 1290944, 3665360, 10407008, 29548480, 83896608, 238206528, 676336640, 1920313664, 5452321152, 15480703232, 43954155648, 124798451968, 354338591744, 1006068870400
(list; graph; refs; listen; history; internal format)
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