A128481 Structure counts for certain radical benzenoidal structures (see Cash and Dias paper for precise definition).

2, 20, 306, 7376, 273956, 15345156, 1274990124, 155024945978, 27422185371264, 6981850496603886, 2547185424690611836

Offset

0,1

Links

Table of n, a(n) for n=0..10.

Gordon G. Cash and Jerry Ray Dias, Computation, Properties and Resonance Topology of Benzenoid Monoradicals and Polyradicals and the Eigenvectors Belonging to Their Zero Eigenvalues, J. Math. Chem., 30 (2001), 429-444.

Crossrefs

Cf. A008793, A128476-A128484.

Sequence in context: A124211 A277308 A373314 * A367862 A177397 A360342

Adjacent sequences: A128478 A128479 A128480 * A128482 A128483 A128484

Keyword

nonn,more

Author

N. J. A. Sloane, May 08 2007

Status

approved