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Number of step shifted (decimated) sequences using exactly three different symbols.
2

%I #7 Aug 22 2017 20:53:10

%S 0,0,3,21,39,288,309,1659,3102,14148,17157,136227,130995,790128,

%T 1791489,5427597,8047839,64467180,64486017,437324331,871627041,

%U 3136899816,4278115101,35355632943,42359479638

%N Number of step shifted (decimated) sequences using exactly three 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 A056372(n)-3*A056371(n)+3.

%Y Cf. A056372.

%K nonn

%O 1,3

%A _Marks R. Nester_