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URL: https://oeis.org/A054938

⇱ A054938 - OEIS

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A054938
Number of chiral chord diagrams on n nodes.
0
0, 0, 0, 1, 26, 348, 4466, 61726, 949795, 16331482, 312298796, 6587217199, 152030203190, 3811719561156, 103171205826822, 2998417379370294, 93127344062857976, 3078376281077418971, 107905190923235526392
OFFSET
1,5
LINKS
V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.
FORMULA
a(n) = A054499(n)-A018191(n). [Liskovets, referring to offset 1 in A054499]. - R. J. Mathar, Oct 01 2011
CROSSREFS
Sequence in context: A042306 A329300 A053494 * A161526 A162368 A161933
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 24 2000
STATUS
approved