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A131468
Sum of all n-digit Catalan numbers.
1
9, 56, 561, 6292, 75582, 950912, 12369285, 35357670, 607283490, 8331383610, 115948830660, 343059613650, 6151850548776, 87900903988156, 263747951750360, 4817228718743672, 70078700916275107, 1025280172561973874, 3116285494907301262
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
Cf. A000108.
Sequence in context: A037613 A274553 A221801 * A231970 A197530 A086888
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Oct 01 2007
STATUS
approved