A113785 a(n) = a(n-1)^2 + 2*a(n-2).

2, 3, 13, 175, 30651, 939484151, 882630469980252103, 779036546537560708779146801314890911, 606897940841168991954208317469740424253072728119076070803668647790914127

Offset: 0

Author

Bob Mckaige (bobmckz(AT)yahoo.com), Jan 20 2006

Keywords

• nonn

References

• Found in a Harpers' magazine article on Chinese civil service exam.

Programs

Mathematica

RecurrenceTable[{a[0]==2,a[1]==3,a[n]==a[n-1]^2+2a[n-2]},a,{n,10}] (* Harvey P. Dale, Jun 20 2017 *)

Extensions

Edited by Jonathan Vos Post and Joshua Zucker, Jan 24 2006