A007281 - OEIS

%I M0605 #18 Mar 03 2020 10:27:06

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

%N Number of `(n,2)'-sequences of length 2n.

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

%D 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.

%H H. Y. Song and S. W. Golomb, <a href="/A007281/a007281.pdf">Generalized Welch-Costas sequences and their application to Vatican arrays</a>, Preprint, 1994. (Annotated scanned copy)

%H Hong-Yeop Song and J. Bok Lee, <a href="https://doi.org/10.1016/S0166-218X(00)00183-9">On (n,k)-sequences</a>, Discrete Appl. Math. 105 (2000), no. 1-3, 183-192.

%K nonn,hard,more

%O 1,3

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