Where t(n) is the n-th Tetranacci number as defined by:
a(0)=1, a(1)=1, a(2)=1, a(3)=1, a(n)=a(n-1)+a(n-2)+a(n-3)+a(n-4)

t(97706)=2714729340 ... 0239263573


Verified PRP by pfgw.

To be completed...