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A328696
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Rectangular array R read by descending antidiagonals: apply x -> (x+1)/2 to each odd term of the Wythoff array (A035513), and delete all others.
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3
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1, 2, 4, 3, 6, 5, 7, 15, 8, 12, 11, 24, 20, 19, 9, 28, 62, 32, 49, 23, 10, 45, 100, 83, 79, 37, 16, 13, 117, 261, 134, 206, 96, 41, 21, 14, 189, 422, 350, 333, 155, 66, 54, 36, 25, 494, 1104, 566, 871, 405, 172, 87, 58, 40, 17, 799, 1786, 1481, 1409, 655
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OFFSET
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1,2
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COMMENTS
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Every positive integer occurs exactly once in R, and every row of R is a linear recurrence sequence.
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LINKS
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EXAMPLE
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Row 1 of the Wythoff array is (1,2,3,5,8,13,21,34,55,89,144,...), so that row 1 of R is (1,2,3,7,11,...) = A107857 (essentially).
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Northwest corner of R:
1, 2, 3, 7, 11, 28, 45, 117, 189, 494, 799
4, 6, 15, 24, 62, 100, 261, 422, 1104, 1786, 4675
5, 8, 20, 32, 83, 134, 350, 566, 1481, 2396, 6272
12, 19, 49, 79, 206, 333, 871, 1409, 3688, 5967, 15621
9, 23, 37, 96, 155, 405, 655, 1714, 2773, 7259, 11745
10, 16, 41, 66, 172, 278, 727, 1176, 3078, 4980, 13037
13, 21, 54, 87, 227, 367, 960, 1553, 4065, 6577, 17218
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MATHEMATICA
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w[n_, k_] := Fibonacci[k + 1] Floor[n*GoldenRatio] + (n - 1) Fibonacci[k];
Table[w[n - k + 1, k], {n, 12}, {k, n, 1, -1}] // Flatten;
q[n_, k_] := If[Mod[w[n, k], 2] == 1, (1 + w[n, k])/2, 0];
t[n_] := Union[Table[q[n, k], {k, 1, 50}]];
u[n_] := If[First[t[n]] == 0, Rest[t[n]], t[n]]
s = Select[Range[40], ! u[#] == {} &]; u1[n_] := u[s[[n]]];
Column[Table[u1[n], {n, 1, 10}]] (* A328696 array *)
v[n_, k_] := u1[n][[k]];
Table[v[n - k + 1, k], {n, 12}, {k, n, 1, -1}] // Flatten (* A328696 sequence *)
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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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