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A203158
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v(n+1)/v(n), where v=A203012.
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2
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7, 247, 21756, 3613701, 974243088, 388409565699, 214946329538304, 157727064375306153, 148245464311769260800, 173696139110375108022159, 248243987235370949531025408, 425095516929076538387157860013
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OFFSET
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1,1
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COMMENTS
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See A093883 for a discussion and guide to related sequences.
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LINKS
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FORMULA
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a(n) ~ 3^(3*n/2 + 1) * exp((n+1)*Pi/(2*sqrt(3)) - 2*n) * n^(2*n). - Vaclav Kotesovec, Sep 07 2023
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MATHEMATICA
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f[j_] := j; z = 12;
v[n_] := Product[Product[f[j]^2 + f[j] f[k] + f[k]^2,
{j, 1, k - 1}], {k, 2, n}]
Table[v[n], {n, 1, z}] (* A203012 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203158 *)
Table[Product[k^2 + k*(n+1) + (n+1)^2, {k, 1, n}], {n, 1, 15}] (* Vaclav Kotesovec, Sep 07 2023 *)
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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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