OFFSET
1,3
COMMENTS
Since the PMF represents a probability function, there is no unique set of numerators. That is, only the relative magnitude of the sum of the numerators matter so long as the denominator is of the same relative magnitude (since the relative magnitudes cancel upon division).
LINKS
FORMULA
a(n)=Sum_{k=0..[ n/2 ]} k^4*n!/((n-2*k)!*2^k*k!).
PROG
(PARI) a(n) = sum(k=0, n\2 , k^4*n!/((n-2*k)!*2^k*k!)); \\ Michel Marcus, Aug 10 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Rajan Murthy, Nov 30 2010
EXTENSIONS
More data from Michel Marcus, Aug 10 2013
STATUS
approved