OFFSET
1,4
COMMENTS
The row {2} could be safely prepended to this triangle. - Gus Wiseman, May 13 2018
LINKS
Alois P. Heinz, Rows n = 1..8, flattened
EXAMPLE
Triangle begins:
{1,1},
{1,2},
{1,2,2},
{1,2,2,3,3},
...
MAPLE
T:= proc(n) option remember; `if`(n=0, 2, (l->
seq(i$l[i], i=1..nops(l)))([T(n-1)]))
end:
seq(T(n), n=1..7); # Alois P. Heinz, May 17 2018
MATHEMATICA
NestList[Join@@Table[Table[i, {#[[i]]}], {i, Length[#]}]&, {2}, 8] (* Gus Wiseman, May 13 2018 *)
CROSSREFS
KEYWORD
tabf,nonn
AUTHOR
EXTENSIONS
More terms from Patrick De Geest
STATUS
approved