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A099913
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Related to the Herschel graph.
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1
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1, 3, 25, 243, 2425, 24243, 242425, 2424243, 24242425, 242424243, 2424242425, 24242424243, 242424242425, 2424242424243, 24242424242425, 242424242424243, 2424242424242425, 24242424242424243, 242424242424242425
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f. : (1-7x-6x^2)/((1-x^2)(1-10x)); a(n)=10a(n-1)+a(n-2)-10a(n-3); a(n)=(-1)^n/11+8*10^n/33+2/3.
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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