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A178937 Partial sums of number of different shapes formed by bending a piece of wire of length n in the plane A066372. 0
1, 2, 4, 7, 12, 20, 35, 58, 101, 172, 300, 509, 888, 1538, 2683, 4611, 8033, 13941, 24236, 41766, 72504, 125592, 217563 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

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

EXAMPLE

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

CROSSREFS

Cf. A001997, A066372.

Sequence in context: A186537 A079970 A079816 * A168368 A182746 A100482

Adjacent sequences:  A178934 A178935 A178936 * A178938 A178939 A178940

KEYWORD

nonn,more,walk

AUTHOR

Jonathan Vos Post, Dec 30 2010

EXTENSIONS

More terms from Nathaniel Johnston, Jan 04 2011

STATUS

approved

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Last modified June 25 20:26 EDT 2017. Contains 288730 sequences.