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%I #19 Apr 11 2017 04:51:23
%S 1,1,1,2,6,17,30,60,100,277,555,990,1616,2168,2467,2648,2294,1892,
%T 1283,810,446,259,114,25,12,8,29,89,23
%N Number of inequivalent Costas arrays of order n under dihedral group.
%C Dihedral group of order 8 acts by rotations and reflections of the square.
%D James K Beard, Jon C Russo, Keith Erickson, Michael Moneleone and Mike Wright, Combinatoric collaboration on Costas arrays and radar applications, Proceedings of the IEEE 2004 Radar Conference, April26-29 2004, ISBN 0-7803-8234-X, pp. 260-265 (entries for orders 24 and 25).
%D James K Beard, Jon C Russo, Keith Erickson, Michael Moneleone and Mike Wright,"Costas Array Generation and Search Methodology," to appear in IEEE Transactions on Aerospace and Electronic Engineering. (Order 26)
%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).
%D CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 227 (contains errors).
%H K. Drakakis, <a href="http://www.costasarrays.org/Enumeration27TalkWeb.pdf">Results of the enumeration of Costas arrays of order 27</a>. [broken link]
%Y Cf. A008404, A001440, A001442, A008403.
%K nonn,hard,more,nice
%O 1,4
%A _N. J. A. Sloane_.
%E a(24)-a(26) from James K Beard (jkbeard(AT)comcast.net), Dec 04 2005
%E a(27) (from the Drakakis link) sent by John Healy (johnjhealy(AT)gmail.com), Jul 17 2008
%E a(28) and a(29) (from http://www.costasarrays.org/), _Joerg Arndt_, Jun 08 2012.
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