A056394 Number of step shifted (decimated) sequence structures using a maximum of five different symbols.

1, 2, 4, 11, 18, 116, 157, 1110, 3076, 21808, 42335, 528612, 859502, 8547036, 31968397, 159716545, 398048506, 5303680564, 8835749347, 99411986634, 331215914028, 1987084129352, 4515860983385, 62095481040014

Offset: 1

Author

Marks R. Nester

Keywords

• nonn

Comments

See A056371 for an explanation of step shifts. 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]

Crossrefs

Cf. A056374.

Formula

Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.