OFFSET
1,10
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..500
FORMULA
a(n) = Sum_{k>=1} binomial(floor(n/2), 5*k)*binomial(ceiling(n/2), k). - Andrew Howroyd, Apr 11 2021
PROG
(PARI) a(n) = {my(m=n\2); sum(k=1, m\5, binomial(m, 5*k)*binomial(n-m, k))} \\ Andrew Howroyd, Apr 11 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(35) and beyond from Andrew Howroyd, Apr 11 2021
STATUS
approved