A056398 Number of step shifted (decimated) sequence structures using exactly four different symbols.

0, 0, 0, 1, 3, 37, 63, 479, 1316, 8597, 14619, 155999, 211231, 1732907, 5302823, 21559909, 43398413, 466495335, 625545865, 5659500031, 15126813765, 72778025365, 132561145173, 1460519554091, 2338565021382

Offset

1,5

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..25.

Formula

A056393(n)-A056392(n).

Crossrefs

Column 4 of A288620.

Cf. A056378.

Sequence in context: A139842 A091824 A056408 * A092074 A183556 A107183

Adjacent sequences: A056395 A056396 A056397 * A056399 A056400 A056401

Keyword

nonn

Author

Marks R. Nester

Status

approved