OFFSET
3,1
FORMULA
a(n) = ((n+1)!/3)^2 for n = 3, 4, 5, ... .
a(n) = A002301(n+1)^2.
MATHEMATICA
Array[((#+1)!/3)^2 &, 20, 3] (* Paolo Xausa, Apr 01 2024 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Jul 21 2009
STATUS
approved