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A269795 Number of similarity classes of vectors with minimal Ducci period n. 0
2, 0, 6, 2, 30, 24, 126, 28, 504, 480, 2046, 990, 8190, 8064, 32730, 4064, 131070, 130536, 524286, 261630, 2097018, 2095104, 8388606, 2096100, 33554400, 33546240, 134217216, 67100670, 536870910, 536837640, 2147483646, 134213632, 8589932538, 8589803520, 34359738210 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..35.

Ron Brown and Jonathan L. Merzel, The number of Ducci sequences with given period, Fibonacci Quart. 45 (2007), no. 2, 115-121.

PROG

(PARI) a(n) = sumdiv(n, d, moebius(n/d)*2^(d-valuation(d, 2)));

CROSSREFS

Sequence in context: A294779 A049257 A054877 * A095834 A106828 A055302

Adjacent sequences:  A269792 A269793 A269794 * A269796 A269797 A269798

KEYWORD

nonn

AUTHOR

Michel Marcus, Mar 05 2016

STATUS

approved

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Last modified October 22 23:18 EDT 2018. Contains 316518 sequences. (Running on oeis4.)