|
Search: id:A056417
|
|
|
| A056417 |
|
Number of step cyclic shifted sequences using exactly four different symbols. |
|
+0
3
|
|
| 0, 0, 0, 3, 12, 136, 204, 1437, 3520, 20700, 31956, 317513, 390364, 2973536, 8504720, 32471391, 61276740, 622088400, 790198476, 6798297447, 17290258088, 79394956608, 138325216092, 1460955482487
(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
|
A056412(n)-4*A056411(n)+6*A002729(n)-4.
|
|
CROSSREFS
|
Cf. A056412.
Sequence in context: A138392 A035087 A056426 this_sequence A098152 A028301 A004168
Adjacent sequences: A056414 A056415 A056416 this_sequence A056418 A056419 A056420
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
|
|
Search completed in 0.002 seconds
|
