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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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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.

Original entry on oeis.org

1, 2, 4, 7, 12, 20, 35, 58, 101, 172, 300, 509, 888, 1538, 2683, 4611, 8033, 13941, 24236, 41766, 72504, 125592, 217563, 374757, 648378, 1120243, 1934800, 3328622, 5743517, 9901009, 17061027, 29314809, 50478219, 86859244, 149408560, 256438542, 440869300
Offset: 1

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Author

Jonathan Vos Post, Dec 30 2010

Keywords

Comments

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

Examples

			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.

Programs

Extensions

More terms from Nathaniel Johnston, Jan 04 2011
More terms from A066372 by Jean-François Alcover, Feb 22 2020
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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