A056409 Number of primitive (aperiodic) step shifted (decimated) sequence structures using exactly five different symbols.

0, 0, 0, 0, 1, 9, 26, 299, 1183, 10700, 24736, 349232, 626053, 6680953, 26364609, 137246955, 353304459, 4826416835, 8199440662, 93679518802, 315943737305, 1913783049725, 4382586624256, 60629067426943

Offset

1,6

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

A056404(n)-A056403(n).

Crossrefs

Cf. A056389.

Sequence in context: A084813 A322764 A325585 * A056399 A256927 A135864

Adjacent sequences: A056406 A056407 A056408 * A056410 A056411 A056412

Keyword

nonn

Author

Marks R. Nester

Status

approved