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A014643
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Triangular array starting with {1,1}; then i-th term in a row gives number of i's in next row.
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4
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1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 3, 3, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11
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internal format)
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OFFSET
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1,4
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COMMENTS
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The row {2} could be safely prepended to this triangle. - Gus Wiseman, May 13 2018
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LINKS
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EXAMPLE
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Triangle begins:
{1,1},
{1,2},
{1,2,2},
{1,2,2,3,3},
...
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MAPLE
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T:= proc(n) option remember; `if`(n=0, 2, (l->
seq(i$l[i], i=1..nops(l)))([T(n-1)]))
end:
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MATHEMATICA
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NestList[Join@@Table[Table[i, {#[[i]]}], {i, Length[#]}]&, {2}, 8] (* Gus Wiseman, May 13 2018 *)
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CROSSREFS
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KEYWORD
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tabf,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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