OFFSET
2,4
LINKS
Eric Weisstein's World of Mathematics, Line Line Picking.
FORMULA
a(n) = numerator((2^(n+3)+(-1)^n*2*(3*n+5))/((n+1)*(n+2)*3^(n+2))). - Amiram Eldar, Apr 14 2022
EXAMPLE
1/18, 1/135, 1/135, 4/1701, 31/20412, 1/1458, 13/32805, 224/1082565, ...
MATHEMATICA
a[n_] := Numerator[(2^(n + 3) + (-1)^n*2*(3*n + 5))/((n + 1)*(n + 2)*3^(n + 2))]; Array[a, 35, 2] (* Amiram Eldar, Apr 14 2022 *)
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Eric W. Weisstein, Jan 28 2005
STATUS
approved