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A056124
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a(n)=3a(n-1)-a(n-2)+8; a(0)=1, a(1)=11.
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1, 11, 40, 117, 319, 848, 2233, 5859, 15352, 40205, 105271, 275616, 721585, 1889147, 4945864, 12948453, 33899503, 88750064, 232350697, 608302035, 1592555416, 4169364221, 10915537255, 28577247552, 74816205409
(list; graph; refs; listen; history; internal format)
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