The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #11 Feb 01 2022 23:57:07
%S 1,1,1,1,2,5,10,9,10,14,18,17,25,23,31,20,19,10,6,4,8,5,10,0,2,2,7,0,
%T 5,4,0,0
%N Number of symmetric Costas arrays of order n that are inequivalent under dihedral group.
%D CRC Handbook of Combinatorial Designs, C. Colbourn and J. Dinitz, Editors, 1996, IV.7: Costas Arrays by Herbert Taylor (IV.7.6, page 259, Table 2.29).
%Y Cf. A008404, A001441, A001442.
%K nonn,hard,more
%O 1,5
%A _N. J. A. Sloane_