OFFSET
1,1
COMMENTS
Also sum of exponents of primes in multinomial coefficient M(4n; n,n,n,n)/M(3n; n,n,n).
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
MAPLE
with(numtheory):a:=proc(n) if n=0 then 0 else bigomega(binomial(4*n, n)) fi end: seq(a(n), n=1..78); # Zerinvary Lajos, Apr 11 2008
MATHEMATICA
Table[Total[FactorInteger[Binomial[4 n, n]][[All, 2]]], {n, 78}] (* Ivan Neretin, Nov 02 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved