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A127129
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Column 2 of triangle A127126.
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10
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1, 3, 18, 139, 1314, 14658, 188012, 2721462, 43837014, 777266691, 15037898091, 315177210360, 7112634073455, 171930274269408, 4431595775955999, 121321383915646543, 3515347574087951331, 107474295428549047272
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OFFSET
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2,2
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COMMENTS
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LINKS
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MATHEMATICA
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T[n_, k_]:= T[n, k]= If[k==n, 1, Coefficient[(1 +x*Sum[x^(r-k-1)*Sum[T[r, c], {c, k+1, r}], {r, k+1, n}] + x^(n+1))^(k+1), x, n-k]]; Table[T[n, 2], {n, 2, 20}] (* G. C. Greubel, Jan 28 2020 *)
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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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