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A103295
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Number of complete rulers with length n.
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3
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1, 1, 1, 3, 4, 9, 17, 33, 63, 128, 248, 495, 988, 1969, 3911, 7857, 15635, 31304, 62732, 125501, 250793, 503203, 1006339, 2014992, 4035985, 8080448, 16169267, 32397761, 64826967, 129774838, 259822143, 520063531, 1040616486, 2083345793, 4168640894, 8342197304, 16694070805
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| For definitions, references and links related to complete rulers see A103294.
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LINKS
| Index entries for sequences related to perfect rulers.
Hugo Pfoertner, Count complete rulers of given length. FORTRAN program.
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FORMULA
| a(n) = Sum(T(n, i), i from 0 to n) = Sum(T(n, i), i from A103298(n) to n), T = A103294
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EXAMPLE
| a(4)=4 counts the complete rulers with length 4, {[0,2,3,4],[0,1,3,4],[0,1,2,4],[0,1,2,3,4]}.
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CROSSREFS
| Cf. A103300 (Perfect rulers with length n).
Sequence in context: A095095 A003611 A192115 * A178784 A192288 A028344
Adjacent sequences: A103292 A103293 A103294 * A103296 A103297 A103298
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KEYWORD
| nonn
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AUTHOR
| Peter Luschny (peter(AT)luschny.de) Feb 28 2005
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EXTENSIONS
| a(30)-a(36) from Hugo Pfoertner (hugo(AT)pfoertner.org), Mar 17 2005
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