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A056388
Number of primitive (aperiodic) step shifted (decimated) sequences using exactly four different symbols.
1
0, 0, 0, 12, 60, 792, 1404, 10704, 31200, 204972, 349956, 3727128, 5065804, 41572908, 127198968, 517279416, 1041517620, 11195605728, 15012935676, 135825494568, 363040468328, 1746669815460, 3181465294092
OFFSET
1,4
COMMENTS
See A056371 for an explanation of step shifts.
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
sum mu(d)*A056378(n/d) where d|n.
CROSSREFS
Sequence in context: A012707 A355671 A108096 * A056378 A231026 A333969
KEYWORD
nonn
STATUS
approved