

A103296


Number of complete rulers with n segments.


4




OFFSET

0,3


COMMENTS

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


LINKS

Table of n, a(n) for n=0..9.
Index entries for sequences related to perfect rulers.


FORMULA

a(n) = Sum(T(i, n), i from n to A004137(n+1)) where T is the triangle described by A103294.


EXAMPLE

a(2)=3 counts the complete rulers with 2 segments, {[0,1,2],[0,1,3],[0,2,3]}.


PROG

Link to FORTRAN program given in A103295.


CROSSREFS

Cf. A103301 (Perfect rulers with n segments), A103299 (Optimal rulers with n segments).
Cf. A103295 (complete rulers of length n).
Sequence in context: A186367 A010842 A140710 * A259859 A298940 A111749
Adjacent sequences: A103293 A103294 A103295 * A103297 A103298 A103299


KEYWORD

nonn,hard


AUTHOR

Peter Luschny Feb 28 2005


EXTENSIONS

a(9) from Hugo Pfoertner, Mar 17 2005


STATUS

approved



