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A142598
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Antidiagonal triangle sequence of coefficient expansion of the general prime product polynomial: f(x,n) = (1 + t^2)/Product_{i=1..n} (1 - t^prime(i + 1)).
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0
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1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 2, 1, 1, 0, 1, 1, 0, 2, 1, 0, 1, 0, 1, 1, 0, 2, 1, 1, 1, 1, 0, 1, 1, 0, 2, 1, 2, 2, 1, 1, 0, 1, 1, 0, 2, 1, 2, 2, 1, 0, 1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 2, 1, 1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 3, 2, 1, 1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 3, 2, 2, 0
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OFFSET
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1,27
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COMMENTS
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Row sums are {1, 1, 2, 3, 3, 4, 6, 6, 8, 11, 11, 15, 18, 19, 25}.
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LINKS
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FORMULA
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f(x,n) = (1 + t^2)/Product_{i=1..n} (1 - t^prime(i + 1)); t(n,m) = expansion(f(x,n)); out_n,m(antidiagonal) = t(n-m+1,n).
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EXAMPLE
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{1},
{1, 0},
{1, 0, 1},
{1, 0, 1, 1},
{1, 0, 1, 1, 0},
{1, 0, 1, 1, 0, 1},
{1, 0, 1, 1, 0, 2, 1},
{1, 0, 1, 1, 0, 2, 1, 0},
{1, 0, 1, 1, 0, 2, 1, 1, 1},
{1, 0, 1, 1, 0, 2, 1, 2, 2, 1},
{1, 0, 1, 1, 0, 2, 1, 2, 2, 1, 0},
{1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 2, 1},
{1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 3, 2, 1},
{1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 3, 2, 2, 0},
{1, 0, 1, 1, 0, 2, 1, 2, 2, 2, 3, 3, 4, 2, 1}
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MATHEMATICA
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Clear[f, b, a] f[t_, n_] := (1 + t^2)/Product[1 - t^Prime[i + 1], {i, 1, n}]; a = Table[Table[SeriesCoefficient[Series[f[t, m], {t, 0, 30}], n], {n, 0, 30}], {m, 1, 31}]; b = Table[Table[a[[n - m + 1]][[m]], {m, 1, n }], {n, 1, 15}] ; Flatten[b]
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CROSSREFS
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KEYWORD
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nonn,uned
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AUTHOR
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STATUS
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approved
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