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A130296
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Triangle read by rows: T[i,1]=i, T[i,j]=1 for 1 < j <= i = 1,2,3,...
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22
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1, 2, 1, 3, 1, 1, 4, 1, 1, 1, 5, 1, 1, 1, 1, 6, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 8, 1, 1, 1, 1, 1, 1, 1, 9, 1, 1, 1, 1, 1, 1, 1, 1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
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OFFSET
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1,2
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COMMENTS
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This sequence was formerly named "reversals of A051340", but it is actually the truncation of A051340 to its lower left triangular part, re-indexed to start rows and columns with 1. - M. F. Hasler, Aug 15 2015
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LINKS
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FORMULA
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Truncation of A051340 to its lower left. By rows, "n" followed by (n-1) 1's. (1,2,3...) in the left border, all 1's in other columns.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 1;
3, 1, 1;
4, 1, 1, 1;
5, 1, 1, 1, 1;
...
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PROG
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(PARI) A130296(i, j)=if(j==1, i, j<=i) \\ The sequence should not be defined for j>i but it is used in several places as infinite square matrix with upper right part equal to zero. - M. F. Hasler, Aug 15 2015
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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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