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1, 8, 46, 240, 1215, 6096, 30508, 152576, 762925, 3814680, 19073466, 95367408, 476837131, 2384185760, 11920928920, 59604644736, 298023223833, 1490116119336, 7450580596870, 37252902984560, 186264514923031, 931322574615408, 4656612873077316, 23283064365386880
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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REFERENCES
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A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pp. 194-196.
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LINKS
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FORMULA
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a(n) = ((5^(n+3))-(8*(n^2) + 44*n + 61))/64.
a(n) = 5a(n-1)+ C(n+2, 2), n >= 0; a(-1)=0.
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MATHEMATICA
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LinearRecurrence[{8, -18, 16, -5}, {1, 8, 46, 240}, 20] (* Harvey P. Dale, Jun 19 2022 *)
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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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