A128476 Structure counts for certain radical benzenoidal structures (see Cash and Dias paper for precise definition).

20, 999, 189792, 153915460

Offset

0,1

Links

Table of n, a(n) for n=0..3.

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: A349964 A347856 A128482 * A160132 A138915 A006427

Adjacent sequences: A128473 A128474 A128475 * A128477 A128478 A128479

Keyword

nonn,more

Author

N. J. A. Sloane, May 08 2007

Status

approved