login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A212864 Number of nondecreasing sequences of n 1..4 integers with no element dividing the sequence sum 1
0, 2, 3, 5, 6, 9, 12, 15, 17, 22, 26, 30, 34, 40, 45, 51, 56, 63, 70, 77, 83, 92, 100, 108, 116, 126, 135, 145, 154, 165, 176, 187, 197, 210, 222, 234, 246, 260, 273, 287, 300, 315, 330, 345, 359, 376, 392, 408, 424, 442, 459, 477, 494, 513, 532, 551, 569, 590, 610, 630, 650 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A212868

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = a(n-1) +a(n-3) -a(n-5) -a(n-7) +a(n-8)

EXAMPLE

All solutions for n=8

..2....2....2....2....2....2....3....2....2....3....2....2....2....3....3

..2....3....2....2....2....2....3....2....3....3....2....3....2....4....3

..3....3....2....2....2....2....3....3....4....3....2....3....2....4....3

..3....3....2....2....2....2....3....3....4....3....3....3....3....4....4

..3....3....3....2....2....2....3....3....4....3....4....3....3....4....4

..3....3....4....2....2....3....3....4....4....3....4....3....3....4....4

..3....3....4....3....2....3....4....4....4....3....4....4....4....4....4

..4....3....4....4....3....3....4....4....4....4....4....4....4....4....4

CROSSREFS

Sequence in context: A124866 A166247 A126785 * A026317 A008768 A067593

Adjacent sequences:  A212861 A212862 A212863 * A212865 A212866 A212867

KEYWORD

nonn

AUTHOR

R. H. Hardin May 29 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified October 24 17:41 EDT 2014. Contains 248516 sequences.