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A345963
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a(n) = (q^2-q+1)/3 where q = 2^(2*n+1) = A004171(n).
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0
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1, 19, 331, 5419, 87211, 1397419, 22366891, 357903019, 5726579371, 91625794219, 1466014804651, 23456245263019, 375299957762731, 6004799458421419, 96076791871613611, 1537228672093301419, 24595658762082757291, 393530540227683855019, 6296488643780380633771, 100743818301035845954219
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OFFSET
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0,2
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LINKS
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FORMULA
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MAPLE
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a:= n-> (q-> (q^2-q+1)/3)(2^(2*n+1)):
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MATHEMATICA
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Table[(2^(4*n + 2) - 2^(2*n + 1) + 1)/3, {n, 0, 19}] (* Amiram Eldar, Jun 30 2021 *)
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PROG
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(PARI) a(n) = my(q=2^(2*n+1)); (q^2-q+1)/3;
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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