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A079542
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Triangular array: T(n,1) = T(n,n) = n and T(n,k) = lcm(T(n-1,k-1), T(n-1,k)) for 1 < k < n.
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1
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1, 2, 2, 3, 2, 3, 4, 6, 6, 4, 5, 12, 6, 12, 5, 6, 60, 12, 12, 60, 6, 7, 60, 60, 12, 60, 60, 7, 8, 420, 60, 60, 60, 60, 420, 8, 9, 840, 420, 60, 60, 60, 420, 840, 9, 10, 2520, 840, 420, 60, 60, 420, 840, 2520, 10, 11, 2520, 2520, 840, 420, 60, 420, 840, 2520, 2520, 11, 12
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OFFSET
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1,2
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COMMENTS
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T(2*n-1,n) = A058312(n-1) for n <= 13.
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LINKS
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EXAMPLE
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Triangle begins:
1
2 2
3 2 3
4 6 6 4
5 12 6 12 5
6 60 12 12 60 6
7 60 60 12 60 60 7
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PROG
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(PARI) T(n, k) = if ((k==1) || (k==n), n, lcm(T(n-1, k-1), T(n-1, k)));
tabl(nn) = for (n=1, nn, for (k=1, n, print1(T(n, k), ", ")); print); \\ Michel Marcus, Apr 25 2018
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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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