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A145677
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Triangle T(n, k) read by rows: T(n, 0) = 1, T(n, n) = n, n>0, T(n,k) = 0, 0 < k < n-1.
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5
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1, 1, 1, 1, 0, 2, 1, 0, 0, 3, 1, 0, 0, 0, 4, 1, 0, 0, 0, 0, 5, 1, 0, 0, 0, 0, 0, 6, 1, 0, 0, 0, 0, 0, 0, 7, 1, 0, 0, 0, 0, 0, 0, 0, 8, 1, 0, 0, 0, 0, 0, 0, 0, 0, 9, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11
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OFFSET
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0,6
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COMMENTS
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The first entry in each row is 1, the last entry in each of the rows consist of the positive integers (starting 1,1,2,3,...), and all other entries in the triangle are 0's (see example).
The vector of (1, 1, 2, 5, 16, 65, 326,...), which is 1 followed by A000522, is an eigenvector of the matrix: 1 + Sum_{k=1..n} T(n,k)*A000522(k-1) = A000522(n).
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LINKS
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FORMULA
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1 + Sum_{k= 1..n} T(n,k) *(k-1) = A002061(n).
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EXAMPLE
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First few rows of the triangle:
1;
1, 1;
1, 0, 2;
1, 0, 0, 3;
1, 0, 0, 0, 4;
1, 0, 0, 0, 0, 5;
1, 0, 0, 0, 0, 0, 6;
1, 0, 0, 0, 0, 0, 0, 7;
1, 0, 0, 0, 0, 0, 0, 0, 8;
1, 0, 0, 0, 0, 0, 0, 0, 0, 9;
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10;
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MATHEMATICA
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T[n_, k_]:= If[k==0, 1, If[k==n, n, 0]];
Table[T[n, k], {n, 0, 14}, {k, 0, n}]//Flatten (* G. C. Greubel, Dec 23 2021 *)
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PROG
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(Sage)
if (k==0): return 1
elif (k==n): return n
else: return 0
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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