OFFSET
1,1
FORMULA
EXAMPLE
Binomial(2*6,6)=924 and 9+2+4=15 hence a(6)=15.
MATHEMATICA
Total[IntegerDigits[#]]&/@Table[Binomial[2n, n], {n, 70}] (* Harvey P. Dale, Jul 22 2022 *)
PROG
(PARI) a(n) = sumdigits(binomial(2*n, n)); \\ Michel Marcus, Feb 17 2021
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Benoit Cloitre, Mar 24 2002
EXTENSIONS
Typo in data corrected by Michel Marcus, Feb 17 2021
STATUS
approved