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A054894
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a_{k+1} = 4*a_k + 4*a_{k-1} - 4*a_{k-2} - a_{k-3}, a_1=1, a_2=2, a_3=11, a_4=48.
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3
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1, 2, 11, 48, 227, 1054, 4921, 22944, 107017, 499106, 2327795, 10856592, 50634107, 236152510, 1101392305, 5136786240, 23957470033, 111735303362, 521122556315, 2430464772336, 11335450631123, 52867436085214, 246568565219689
(list; graph; refs; listen; history; internal format)
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