%I A001441
%S A001441 1,1,1,2,6,17,30,60,100,277,555,990,1616,2168,2467,2648,2294,1892,1283,
%T A001441 810,446,259,114,25,12,8,29
%N A001441 Number of inequivalent Costas arrays of order n under dihedral group.
%C A001441 Dihedral group of order 8 acts by rotations and refections of the square.
%D A001441 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 A001441 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 A001441 CRC Handbook of Combinatorial Designs, C. Colbourn and J. Dinitz Eds., 
               1996, IV.7: Costas Arrays by Herbert Taylor (IV.7.6, page 259, Table 
               2.29).
%D A001441 CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 227 
               (contains errors).
%H A001441 K. Drakakis, <a href="http://www.costasarrays.org/Enumeration27TalkWeb.pdf">
               Results of the enumeration of Costas arrays oforder 27</a>.
%Y A001441 Cf. A008404, A001440, A001442, A008403.
%Y A001441 Sequence in context: A105146 A024310 A064516 this_sequence A037261 A072077 
               A014833
%Y A001441 Adjacent sequences: A001438 A001439 A001440 this_sequence A001442 A001443 
               A001444
%K A001441 nonn,nice
%O A001441 1,4
%A A001441 N. J. A. Sloane (njas(AT)research.att.com).
%E A001441 a(24)-a(26) from James K Beard (jkbeard(AT)comcast.net), Dec 04 2005
%E A001441 a(27) (from the Drakakis link) sent by John Healy (johnjhealy(AT)gmail.com), 
               Jul 17 2008