OFFSET
2,2
COMMENTS
A061038(n)/a(n+2) for n >= 2 gives the reduced fractions 1/9, 4/49, 4, 4/81, 1/25, 4/121, 16/9, 4/169, ...
LINKS
G. C. Greubel, Table of n, a(n) for n = 2..1000
FORMULA
Sum_{n>=3} 1/a(n) = 79*Pi^2/192 - 65/18. - Amiram Eldar, Aug 14 2022
MATHEMATICA
A061037[n_] := Numerator[(n - 2)*(n + 2)/(4 n^2)]; Table[A061037[n]^2, {n, 2, 100}] (* G. C. Greubel, Sep 19 2018 *)
PROG
(Magma) A061037:=func< n | Numerator(1/4-1/n^2) >; A181763:=func< n | A061037(n)^2 >; [ A181763(n): n in [2..50] ]; // Klaus Brockhaus, Jan 09 201
(PARI) a(n) = numerator((n-2)*(n+2)/(4*n^2));
for(n=2, 100, print1(a(n)^2, ", ")) \\ G. C. Greubel, Sep 19 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Curtz, Nov 14 2010
STATUS
approved