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

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

Offset

0,1

References

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

Links

Table of n, a(n) for n=0..8.

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 *)

Crossrefs

Sequence in context: A137459 A267422 A072162 * A118323 A113494 A139520

Adjacent sequences: A113782 A113783 A113784 * A113786 A113787 A113788

Keyword

nonn

Author

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

Extensions

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

Status

approved