A056388 - OEIS

%I #6 Aug 22 2017 20:53:10

%S 0,0,0,12,60,792,1404,10704,31200,204972,349956,3727128,5065804,

%T 41572908,127198968,517279416,1041517620,11195605728,15012935676,

%U 135825494568,363040468328,1746669815460,3181465294092

%N Number of primitive (aperiodic) step shifted (decimated) sequences using exactly four different symbols.

%C See A056371 for an explanation of step shifts.

%D 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]

%F sum mu(d)*A056378(n/d) where d|n.

%K nonn

%O 1,4

%A _Marks R. Nester_