A054930 Number of complementary pairs of circulant digraphs on n nodes.

1, 1, 2, 3, 4, 10, 8, 23, 27, 70, 56, 312, 180, 700, 1096, 2131, 2068, 11020, 7316, 34008, 44232, 104968, 95420, 531296, 419654, 1398500, 1864674, 5638352, 4794088, 33597760, 17896832

Offset

1,3

Links

Table of n, a(n) for n=1..31.

V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.

Formula

Average of A049297 and A049309.

a(2*n) = A049297(2*n)/2; a(2*n-1) = (A049297(2*n-1) + A049309(n))/2. - Andrew Howroyd, Jan 16 2022

Crossrefs

Cf. A049297, A049309, A054929.

Sequence in context: A203070 A088303 A193858 * A329230 A119798 A015976

Adjacent sequences: A054927 A054928 A054929 * A054931 A054932 A054933

Keyword

nonn,more

Author

N. J. A. Sloane, May 24 2000

Extensions

a(12)-a(31) added by Andrew Howroyd, Jan 16 2022

Status

approved