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A006606 Nonperiodic autocorrelation functions of length n.
(Formerly M0770)
0
1, 2, 3, 6, 10, 20, 36, 72, 135, 272, 528, 1048, 2080, 4160, 8242, 16500, 32895, 65750, 131328, 262612, 524733, 1049600, 2098176, 4195930, 8390620, 16781312, 33558177, 67116876, 134225920, 268450626, 536887270 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

E. G. Whitehead, Jr., Autocorrelation of (+1,-1) matrices, pp. 329-336 of Combinatorial Mathematics (Canberra, 1977), Lect. Notes Math. 686, 1978. [From Jayadev Acharya (jayadev(AT)ucsd.edu), Aug 20 2009]

LINKS

Table of n, a(n) for n=1..31.

E. G. Whitehead, Jr., Autocorrelation of (+1,-1) sequences. [From Jayadev Acharya (jayadev(AT)ucsd.edu), Aug 20 2009]

CROSSREFS

Sequence in context: A231331 A008927 A052525 * A120421 A005418 A002215

Adjacent sequences:  A006603 A006604 A006605 * A006607 A006608 A006609

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from a(16) Jayadev Acharya (jayadev(AT)ucsd.edu), Aug 20 2009

a(22)-a(31) from Sean A. Irvine, May 13 2017

STATUS

approved

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Last modified February 22 05:58 EST 2018. Contains 299430 sequences. (Running on oeis4.)