A034692 a(n+1) = smallest number that is not the sum of a(n) or fewer terms of a(1),...,a(n).

1, 2, 5, 23, 455, 197447, 38895873863, 1512881323770591465287, 2288809899755012359449577849239960517955399, 5238650757216549725917660910593720468102050623548424798300898740084824366637074960199

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Formula

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

Mathematica

RecurrenceTable[{a[1]==1, a[2]==2, a[n]==a[n-1]^2+2a[n-1]- a[n-1] a[n-2]- a[n-2]}, a, {n, 10}] (* Harvey P. Dale, Dec 24 2014 *)

Crossrefs

Sequence in context: A158889 A181074 A078125 * A347525 A002507 A137094

Adjacent sequences: A034689 A034690 A034691 * A034693 A034694 A034695

Keyword

nonn

Author

Erich Friedman

Extensions

Formula and more terms from Christian G. Bower.

Status

approved