I. Gutman et al., CALCULATING THE DETERMINANT OF THE ADJACENCY MATRIX AND COUNTING KEKULE STRUCTURES IN CIRCULENES, Zeitschrift fur Naturforschung. A, A journal of physical sciences, 49(11), 1994, pp. 1053-1058
The determinant of the adjacentcy matrix, the algebraic structure coun
t and the Kekule structure count of circulenes are shown to conform to
simple expressions containing Fibonacci numbers.