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A199567
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a(n) = 7*9^n + 1.
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2
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8, 64, 568, 5104, 45928, 413344, 3720088, 33480784, 301327048, 2711943424, 24407490808, 219667417264, 1977006755368, 17793060798304, 160137547184728, 1441237924662544, 12971141321962888, 116740271897665984, 1050662447078993848, 9455962023710944624, 85103658213398501608
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 9*a(n-1) - 8 for n > 0.
a(n) = 10*a(n-1) - 9*a(n-2) for n > 1.
G.f.: 8*(1-2*x)/((1-x)*(1-9*x)).
E.g.f.: exp(x)*(7*exp(8*x) + 1).
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PROG
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(Magma) [7*9^n+1: n in [0..30]];
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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STATUS
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approved
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