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A171824
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Triangle T(n,k)= binomial(n + k,n) + binomial(2*n-k,n) read by rows.
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1
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2, 3, 3, 7, 6, 7, 21, 14, 14, 21, 71, 40, 30, 40, 71, 253, 132, 77, 77, 132, 253, 925, 469, 238, 168, 238, 469, 925, 3433, 1724, 828, 450, 450, 828, 1724, 3433, 12871, 6444, 3048, 1452, 990, 1452, 3048, 6444, 12871, 48621, 24320, 11495, 5225, 2717, 2717, 5225, 11495, 24320, 48621
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history;
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins as:
2;
3, 3;
7, 6, 7;
21, 14, 14, 21;
71, 40, 30, 40, 71;
253, 132, 77, 77, 132, 253;
925, 469, 238, 168, 238, 469, 925;
3433, 1724, 828, 450, 450, 828, 1724, 3433;
12871, 6444, 3048, 1452, 990, 1452, 3048, 6444, 12871;
48621, 24320, 11495, 5225, 2717, 2717, 5225, 11495, 24320, 48621;
184757, 92389, 43824, 19734, 9009, 6006, 9009, 19734, 43824, 92389, 184757;
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MATHEMATICA
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T[n_, k_] = Binomial[n+k, k] + Binomial[2*n-k, n-k];
Table[T[n, k], {n, 0, 10}, {k, 0, n}]//Flatten
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PROG
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(Magma)
T:= func< n, k | Binomial(n+k, n) + Binomial(2*n-k, n) >;
[T(n, k): k in [0..n], n in [0..12]]; // G. C. Greubel, Apr 29 2021
(Sage)
def T(n, k): return binomial(n+k, n) + binomial(2*n-k, n)
flatten([[T(n, k) for k in (0..n)] for n in (0..12)]) # G. C. Greubel, Apr 29 2021
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Formula and row sums reference added by the Assoc. Editors of the OEIS, Feb 24 2010
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STATUS
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approved
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