OFFSET
1,1
LINKS
R. P. Stanley and Eric Weisstein Catalan Number
EXAMPLE
Sum of all 1-digit Catalan numbers is 9.
Sum of all 2-digit Catalan numbers is 56.
Sum of all 3-digit Catalan numbers is 561.
MAPLE
A131468 := proc(n)
local a, C, j;
a := 0 ;
for j from 0 do
C := A000108(j) ;
nd := A055642(C) ;
if nd >n then
return a;
elif nd = n then
a := a+C ;
end if;
end do:
end proc: # R. J. Mathar, Jun 20 2015
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Oct 01 2007
STATUS
approved