A001440 - OEIS

A001440

Number of symmetric Costas arrays of order n that are inequivalent under dihedral group.

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

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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: A154680 A323728 A140469 * A258779 A097378 A078310

Adjacent sequences: A001437 A001438 A001439 * A001441 A001442 A001443

KEYWORD

nonn,hard,more

AUTHOR

N. J. A. Sloane

STATUS

approved