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A193630
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Augmentation of the triangle A074909. See Comments.
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1
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1, 1, 2, 1, 5, 7, 1, 9, 28, 33, 1, 14, 74, 181, 191, 1, 20, 159, 637, 1333, 1297, 1, 27, 300, 1767, 5906, 11029, 10063, 1, 35, 517, 4190, 20256, 59324, 101351, 87669, 1, 44, 833, 8873, 58339, 244125, 645146, 1024949, 847015, 1, 54, 1274, 17241, 147680
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OFFSET
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0,3
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COMMENTS
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For an introduction to the unary operation "augmentation" as applied to triangular arrays or sequences of polynomials, see A193091.
Regarding A193630, writing the general term as w(n,k),
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LINKS
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EXAMPLE
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1
1...2
1...5....7
1...9....28...33
1...14...74...181...191
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MATHEMATICA
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p[n_, k_] := Binomial[n + 1, k];
Table[p[n, k], {n, 0, 7}, {k, 0, n}] (* A074909 *)
m[n_] := Table[If[i <= j, p[n + 1 - i, j - i], 0], {i, n}, {j, n + 1}]
TableForm[m[4]]
w[0, 0] = 1; w[1, 0] = p[1, 0]; w[1, 1] = p[1, 1];
v[0] = w[0, 0]; v[1] = {w[1, 0], w[1, 1]};
v[n_] := v[n - 1].m[n]
TableForm[Table[v[n], {n, 0, 6}]] (* A193630 *)
Flatten[Table[v[n], {n, 0, 8}]]
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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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