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A103447
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Triangle read by rows: T(n,k) = Moebius(binomial(n,k)) (0 <= k <= n).
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5
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1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 0, 1, 0, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 0, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 0, 0, 0, -1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 0, -1, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1, 1, -1, -1, -1, -1, 0, 0, 0, 0, -1, -1, -1, -1, 1
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OFFSET
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0,1
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COMMENTS
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T(2*n, n) = 0 for all n except n=0, 1, 2 and 4 (Granville and Ramare).
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LINKS
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FORMULA
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T(n, k) = Moebius(binomial(n, k)) (0 <= k <= n).
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EXAMPLE
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T(3,2)=-1 because binomial(3,2)=3 and Moebius(3)=-1.
Triangle begins:
1;
1, 1;
1, -1, 1;
1, -1, -1, 1;
1, 0, 1, 0, 1;
1, -1, 1, 1, -1, 1;
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MAPLE
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with(numtheory):T:=proc(n, k) if k<=n then mobius(binomial(n, k)) else 0 fi end: for n from 0 to 15 do seq(T(n, k), k=0..n) od; # yields sequence in triangular form
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MATHEMATICA
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T[n_, k_]:= MoebiusMu[Binomial[n, k]]; Table[T[n, k], {n, 0, 15}, {k, 0, n}]//Flatten (* G. C. Greubel, Jun 16 2021 *)
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PROG
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(PARI) T(n, k) = moebius(binomial(n, k))
(Magma) [MoebiusMu(Binomial(n, k)): k in [0..n], n in [0..15]]; // G. C. Greubel, Jun 16 2021
(Sage)
def T(n, k): return moebius(binomial(n, k))
flatten([[T(n, k) for k in (0..n)] for n in (0..15)]) # G. C. Greubel, Jun 16 2021
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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