A123355 Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).

1, 3, 20, 155, 1315, 11957, 114972, 1157650, 12115220, 131015260

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Cyvin S.J., Gutman I. (1988) Classes of Basic Benzenoids (III). In: Kekulé Structures in Benzenoid Hydrocarbons. Lecture Notes in Chemistry, vol 46. Springer, Berlin, Heidelberg (see p. 188)

Crossrefs

Sequence in context: A091168 A126596 A074560 * A371815 A258791 A192509

Adjacent sequences: A123352 A123353 A123354 * A123356 A123357 A123358

Keyword

nonn

Author

N. J. A. Sloane, Oct 10 2006

Status

approved