OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..300
MATHEMATICA
PROG
(Magma)
A203431:= func< n | n eq 1 select 2 else (&*[n-j+Floor((n+1)/2)-Floor((j+1)/2): j in [0..n-1]]) >;
[A203431(n): n in [1..25]]; // G. C. Greubel, Sep 27 2023
(SageMath)
def A203431(n): return product(n-j+((n+1)//2)-((j+1)//2) for j in range(n))
[A203431(n) for n in range(1, 31)] # G. C. Greubel, Sep 27 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 02 2012
STATUS
approved