1,1

Combinatorial limit of row n is A080023, which is essentially A000032.

Table of n, a(n) for n=1..83.

The first 6 rows:

2

2 3

2 3 5

2 3 4 8

2 3 4 7 13

2 3 4 7 11 21

Cf. A000032, A000045, A080023, A169613, A169615, A169616.

Sequence in context: A291048 A022467 A306894 * A037126 A080092 A164738

Adjacent sequences: A169611 A169612 A169613 * A169615 A169616 A169617

nonn,tabl

Clark Kimberling, Dec 03 2009

approved