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

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

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: A008927 A331488 A052525 * A120421 A005418 A329699

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