Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A056426
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A056426 Number of primitive (period n) step cyclic shifted sequences using exactly four different symbols. +0
2
0, 0, 0, 3, 12, 136, 204, 1434, 3520, 20688, 31956, 317374, 390364, 2973332, 8504708, 32469954, 61276740, 622084744, 790198476, 6798276744, 17290257884, 79394924652, 138325216092, 1460955163540 (list; graph; listen)
OFFSET

1,4

COMMENT

See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent.

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

FORMULA

Sum mu(d)*A056417(n/d) where d|n.

CROSSREFS

Cf. A056421.

Sequence in context: A073987 A138392 A035087 this_sequence A056417 A098152 A028301

Adjacent sequences: A056423 A056424 A056425 this_sequence A056427 A056428 A056429

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified July 4 18:25 EDT 2008. Contains 140886 sequences.


AT&T Labs Research