A121972 Number of isomeric aza-benzenoids with five nitrogen atoms.

1, 14, 216, 2442, 24611, 223717, 1894520, 15169211, 116213717, 8588186640

Offset

1,2

References

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.

Links

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

Example

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

Crossrefs

Sequence in context: A275224 A275144 A275354 * A240781 A353146 A113894

Adjacent sequences: A121969 A121970 A121971 * A121973 A121974 A121975

Keyword

nonn

Author

Parthasarathy Nambi, Sep 05 2006

Status

approved