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A056437
Number of step cyclic shifted sequence structures using exactly five different symbols.
1
0, 0, 0, 0, 1, 3, 6, 52, 148, 1140, 2306, 30121, 48476, 478957, 1762917, 8601630, 20789656, 268188642, 431583572, 4685759111, 15045763312, 86991023001, 190548007556, 2526401808203, 4873374476388, 39199367162137
OFFSET
1,6
COMMENTS
See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent. Permuting the symbols will not change the structure.
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
CROSSREFS
Column 5 of A288627.
Cf. A056418.
Sequence in context: A111752 A102931 A056447 * A309320 A012275 A067608
KEYWORD
nonn
STATUS
approved