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A171309 Number of 0..3 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1 0
4, 15, 53, 138, 483, 1678, 5634, 18915, 62325, 204315, 683210, 2277118, 7559559, 25132611, 83206528, 274465209, 907716605, 3004041236, 9908081432 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

column 4 of A171307.

LINKS

Table of n, a(n) for n=1..19.

CROSSREFS

Sequence in context: A057332 A230623 A162978 * A210781 A303271 A289802

Adjacent sequences:  A171306 A171307 A171308 * A171310 A171311 A171312

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 06 2009

STATUS

approved

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Last modified September 18 11:38 EDT 2021. Contains 347527 sequences. (Running on oeis4.)