OFFSET
0,3
MATHEMATICA
a[n_] := Sum[4^(n-k) * Pochhammer[k/4, n-k], {k, 0, n}]; Array[a, 20, 0] (* Amiram Eldar, Mar 06 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Mar 06 2024
STATUS
approved