login
A056396
Number of step shifted (decimated) sequence structures using exactly two different symbols.
1
0, 1, 2, 5, 5, 19, 13, 47, 51, 139, 107, 623, 351, 1399, 2171, 4463, 4115, 22111, 14601, 68015, 88375, 209935, 190745, 1075199, 839127, 2796999, 3730583, 11276703, 9587579, 67195519, 35792567
OFFSET
1,3
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]
FORMULA
A056391(n)-1.
CROSSREFS
Column 2 of A288620.
Cf. A056376.
Sequence in context: A154816 A367299 A140600 * A085043 A338586 A143818
KEYWORD
nonn
STATUS
approved