1,2

Number of different shapes formed by bending (+ or - 90 degrees at each bend) a piece of wire of length <= n in the plane.

Table of n, a(n) for n=1..23.

a(9) = 1 + 1 + 2 + 3 + 5 + 8 + 15 + 23 + 43 = 101 is prime. The next prime is a(15) = 2683.

Cf. A001997, A066372.

Sequence in context: A186537 A079970 A079816 * A168368 A182746 A100482

Adjacent sequences: A178934 A178935 A178936 * A178938 A178939 A178940

nonn,more,walk

Jonathan Vos Post, Dec 30 2010

More terms from Nathaniel Johnston, Jan 04 2011

approved