login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A001440 Number of symmetric Costas arrays of order n that are inequivalent under dihedral group. 3
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, 5, 4, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

REFERENCES

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).

LINKS

Table of n, a(n) for n=1..32.

CROSSREFS

Cf. A008404, A001441, A001442.

Sequence in context: A126842 A154680 A140469 * A258779 A097378 A078310

Adjacent sequences:  A001437 A001438 A001439 * A001441 A001442 A001443

KEYWORD

nonn,hard,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 7 17:09 EST 2016. Contains 278888 sequences.