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A323216
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Main diagonal of A323212.
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0
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1, 1, 7, 56, 477, 4180, 37401, 339184, 3107583, 28691938, 266537777, 2488340790, 23326071990, 219416722056, 2070014554612, 19578402111888, 185583671757949, 1762564846962972, 16768616366059543, 159777503753057786, 1524516616304476102, 14564266581096857240
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listen;
history;
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internal format)
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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nmax = 21; T = PadRight[CoefficientList[# + O[y]^(nmax+1), y], nmax+1]& /@ CoefficientList[1 + 2 x (x+1)/(Sqrt[1 - 4 y] - 2 x (x+1) + 1) + O[x]^(nmax+1), x];
a[n_] := T[[n + 1, n + 1]];
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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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