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A188526
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a(n) = 3^(2*n + 3) + 2^n.
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2
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28, 245, 2191, 19691, 177163, 1594355, 14348971, 129140291, 1162261723, 10460353715, 94143179851, 847288611491, 7625597489083, 68630377373075, 617673396300331, 5559060566588291, 50031545099065243, 450283905891128435, 4052555153019238411
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listen;
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OFFSET
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0,1
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COMMENTS
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REFERENCES
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Kees Doets and Jan van Eijck, The Haskell Road to Logic, Maths and Programming, The King's College Publications, London 2006. Cf. exercise 7.9, p 239.
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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