A163862 a(n) = A170907(2^n).

1, 4, 13, 47, 176, 678, 2658, 10521, 41860, 166995, 667100, 2666651, 10663099, 42645332

Offset: 0

Author

N. J. A. Sloane, May 11 2010

Keywords

• nonn
• more

Comments

This sequence determines the "lim sup" of the growth of A151723.

Crossrefs

Cf. A151723, A170907.

Formula

It appears that a(n)/4^n converges to a constant c which is roughly 0.635.

Extensions

a(8) onwards from David Applegate, May 12 2010