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See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure.
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]
Table of n, a(n) for n=1..27.
Sequence in context: A051681 A267987 A056407 * A189314 A215746 A128893
Adjacent sequences: A056394 A056395 A056396 * A056398 A056399 A056400
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)