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A007281 Number of `(n,2)'-sequences of length 2n.
(Formerly M0605)
2
1, 1, 2, 2, 5, 4, 8, 6, 1, 0, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

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

H.-Y. Song and S. W. Golomb, Generalized Welch-Costas sequences and their application to Vatican arrays, in Proc. 2nd International Conference on Finite Fields: Theory, Algorithms and Applications (Las Vegas 1993) Contemp. Math. vol. 168 348 1994.

Hong-Yeop Song and J. Bok Lee, "On (n,k)-sequences", Discrete Appl. Math. 105 (2000), no. 1-3, 183-192.

LINKS

Table of n, a(n) for n=1..13.

H. Y. Song and S. W. Golomb, Generalized Welch-Costas sequences and their application to Vatican arrays, Preprint, 1994. (Annotated scanned copy)

CROSSREFS

Sequence in context: A000019 A318196 A081177 * A101085 A088880 A008818

Adjacent sequences:  A007278 A007279 A007280 * A007282 A007283 A007284

KEYWORD

nonn,hard

AUTHOR

Hong-Yeop Song (hysong(AT)yonsei.ac.kr)

STATUS

approved

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Last modified February 26 09:44 EST 2020. Contains 332277 sequences. (Running on oeis4.)