A007281 Number of `(n,2)'-sequences of length 2n. (Formerly M0605)

1, 1, 2, 2, 5, 4, 8, 6, 1, 0, 1, 0, 0

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.

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)

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

Crossrefs

Sequence in context: A318196 A367213 A081177 * A101085 A088880 A008818

Adjacent sequences: A007278 A007279 A007280 * A007282 A007283 A007284

Keyword

nonn,hard,more

Author

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

Status

approved