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A056417 Number of step cyclic shifted sequences using exactly four different symbols. 2
0, 0, 0, 3, 12, 136, 204, 1437, 3520, 20700, 31956, 317513, 390364, 2973536, 8504720, 32471391, 61276740, 622088400, 790198476, 6798297447, 17290258088, 79394956608, 138325216092, 1460955482487 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

COMMENTS

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

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

FORMULA

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

CROSSREFS

Cf. A056412.

Sequence in context: A152544 A035087 A056426 * A098152 A028301 A004168

Adjacent sequences:  A056414 A056415 A056416 * A056418 A056419 A056420

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

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Last modified February 15 13:16 EST 2012. Contains 205795 sequences.