1,2

N. Trinajstich, Z. Jericevic, J. V. Knop, W. R. Muller and K. Szymanski, "Computer generation of isomeric structures", Pure and Appl. Chem., vol. 55 (1983) pp. 379-390.

Table of n, a(n) for n=1..10.

If n=5 then the number of isomeric aza-benzenoids with five nitrogen atoms is 24611. Here n is the number of hexagons.

Sequence in context: A275224 A275144 A275354 * A240781 A113894 A225315

Adjacent sequences: A121969 A121970 A121971 * A121973 A121974 A121975

nonn

Parthasarathy Nambi, Sep 05 2006

approved