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A103297 Number of different lengths that perfect rulers with n segments can have. 3
1, 1, 2, 3, 3, 4, 4, 6, 6, 7, 7, 7, 8, 10, 11, 11, 11, 11, 11, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

For definitions, references and links related to complete rulers see A103294.

LINKS

Table of n, a(n) for n=0..19.

Index entries for sequences related to perfect rulers.

FORMULA

a(n) = A004137(n+1) - A004137(n) for n>= 1.

EXAMPLE

a(5)=4 because a perfect ruler with 5 segments may have the length 10, 11, 12 or 13.

CROSSREFS

Cf. A103298.

Sequence in context: A226107 A105677 A230476 * A274017 A238221 A168173

Adjacent sequences:  A103294 A103295 A103296 * A103298 A103299 A103300

KEYWORD

nonn,hard

AUTHOR

Peter Luschny Feb 28 2005

STATUS

approved

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Last modified September 22 00:25 EDT 2017. Contains 292326 sequences.