OFFSET
0,3
COMMENTS
MATHEMATICA
Join[{0}, Flatten[Table[#[[2]], #[[1]]]&/@With[{nn=6}, Thread[{Join[Accumulate[ CatalanNumber[ Range[ nn]]]], Range[nn]}]]]] (* Harvey P. Dale, Sep 06 2023 *)
PROG
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Antti Karttunen, Jul 18 2014
STATUS
approved