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A339236
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Irregular triangle of incomplete Leonardo numbers read by rows. T(n, k) = 2*(Sum_{j=0..k} binomial(n-j, j)) - 1, for n>=0 and 0<=k<=floor(n/2).
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0
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1, 1, 1, 3, 1, 5, 1, 7, 9, 1, 9, 15, 1, 11, 23, 25, 1, 13, 33, 41, 1, 15, 45, 65, 67, 1, 17, 59, 99, 109, 1, 19, 75, 145, 175, 177, 1, 21, 93, 205, 275, 287, 1, 23, 113, 281, 421, 463, 465, 1, 25, 135, 375, 627, 739, 753, 1, 27, 159, 489, 909, 1161, 1217, 1219
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OFFSET
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0,4
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LINKS
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FORMULA
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EXAMPLE
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Triangle begins:
1;
1;
1, 3;
1, 5;
1, 7, 9;
1, 9, 15;
1, 11, 23, 25;
1, 13, 33, 41;
1, 15, 45, 65, 67;
1, 17, 59, 99, 109;
...
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MATHEMATICA
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T[n_, k_] := 2 * Sum[Binomial[n - j, j], {j, 0, k}] - 1; Table[T[n, k], {n, 0, 14}, {k, 0, Floor[n/2]}] // Flatten (* Amiram Eldar, Nov 28 2020 *)
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PROG
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(PARI) T(n, k) = 2*sum(j=0, k, binomial(n-j, j)) -1;
row(n) = vector(n\2+1, k, k--; T(n, k));
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CROSSREFS
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Cf. A001595 (Leonardo numbers: right diagonal).
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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