OFFSET
3,1
FORMULA
a(n) = round((4 + 2*cot(Pi/n))/cot(Pi/n)).
MATHEMATICA
Table[Round[(4 + 2 Cot[Pi/n])/Cot[Pi/n]], {n, 3, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, May 04 2021
STATUS
approved