A121949 Number of isomeric aza-benzenoids with one nitrogen atom and n hexagons.

1, 2, 10, 43, 210, 1026, 5130, 25770, 130350, 661458

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 one nitrogen atom is 210. Here n is the number of hexagons.

Crossrefs

Sequence in context: A197048 A175613 A296001 * A005144 A305657 A064835

Adjacent sequences: A121946 A121947 A121948 * A121950 A121951 A121952

Keyword

nonn

Author

Parthasarathy Nambi, Sep 04 2006

Status

approved