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A098698
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Main diagonal of array in A098697.
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1
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1, 4, 64, 1778, 73848, 4188592, 306690520, 27893327856, 3063657097664, 397720778283584, 59997757426314624, 10373545999796847232, 2032368096229682220160, 446879795164524710777856
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OFFSET
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0,2
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COMMENTS
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Diagonal of Euler-Seidel matrix with start sequence A000248.
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LINKS
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FORMULA
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a(n) = Sum_{k=0..n} C(n, k) * A000248(2n-k).
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MATHEMATICA
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a248[0] = 1; a248[n_] := Sum[Binomial[n, k]*(n - k)^k, {k, 0, n}];
T[0, n_] := T[0, n] = a248[n]; T[k_, n_] := T[k, n] = T[k - 1, n] + T[k - 1, n + 1];
a[n_] := T[n, n];
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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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