OFFSET
1,1
FORMULA
a(n)=13(-1 + t[n] + t[n]^2)Sqrt[13 (26 + 10 t[n] + t[n]^2)] where t [n] satisfies the linear recurrence t[n]=1299 t[n-1]-1299 t[n-2] + t[n-2] with t[1]=13, t[2]=23377, t[3]=30349813.
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 08 2013
STATUS
approved