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A006606 Nonperiodic autocorrelation functions of length n.
(Formerly M0770)

%I M0770

%S 1,2,3,6,10,20,36,72,135,272,528,1048,2080,4160,8242,16500,32895,

%T 65750,131328,262612,524733,1049600,2098176,4195930,8390620,16781312,

%U 33558177,67116876,134225920,268450626,536887270

%N Nonperiodic autocorrelation functions of length n.

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

%D 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]

%H E. G. Whitehead, Jr., <a href="https://doi.org/10.1007/BFb0062549">Autocorrelation of (+1,-1) sequences.</a> [From Jayadev Acharya (jayadev(AT)ucsd.edu), Aug 20 2009]

%K nonn

%O 1,2

%A _N. J. A. Sloane_.

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

%E a(22)-a(31) from _Sean A. Irvine_, May 13 2017

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Last modified June 13 13:40 EDT 2021. Contains 344999 sequences. (Running on oeis4.)