OFFSET
1,6
PROG
(PARI) { a(n) = sum(i=1, n\5, binomial(n\2-1, i) * binomial(n+1-n\2, 4*i) ) } \\ Max Alekseyev, Feb 09 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Max Alekseyev, Feb 09 2010
STATUS
approved