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

1,2

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]

Links

Table of n, a(n) for n=1..24.

Formula

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

Crossrefs

Cf. A056374.

Sequence in context: A218911 A056393 A319417 * A056395 A288621 A053031

Adjacent sequences: A056391 A056392 A056393 * A056395 A056396 A056397

Keyword

nonn

Author

Marks R. Nester

Status

approved