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A056416
Number of step cyclic shifted sequences using exactly three different symbols.
2
0, 0, 1, 6, 9, 56, 51, 258, 380, 1500, 1611, 12298, 10245, 57108, 121721, 346146, 474489, 3589534, 3397143, 21984804, 41570773, 142619388, 186027579, 1476414178, 1694455320, 8146633638, 15690141155
OFFSET
1,4
COMMENTS
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. [See A056391 for pdf file of Chap. 2]
FORMULA
A056411(n)-3*A002729(n)+3.
CROSSREFS
Cf. A056411.
Sequence in context: A254207 A098662 A056425 * A061401 A359800 A264380
KEYWORD
nonn
STATUS
approved