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Number of step cyclic shifted sequences using exactly four different symbols.
2

%I #6 Aug 22 2017 20:53:11

%S 0,0,0,3,12,136,204,1437,3520,20700,31956,317513,390364,2973536,

%T 8504720,32471391,61276740,622088400,790198476,6798297447,17290258088,

%U 79394956608,138325216092,1460955482487

%N Number of step cyclic shifted sequences using exactly four different symbols.

%C See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent.

%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 A056412(n)-4*A056411(n)+6*A002729(n)-4.

%Y Cf. A056412.

%K nonn

%O 1,4

%A _Marks R. Nester_