A121975 - OEIS

This site is supported by donations to The OEIS Foundation.

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.

Other ways to donate

A121975

Number of isomeric aza-benzenoids with seven nitrogen atoms.

2, 100, 2276, 38500, 525764, 6229444, 66405417, 652844870, 6018548260 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,1`
	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=2..10.`
	EXAMPLE	`If n=5 then the number of isomeric aza-benzenoids with seven nitrogen atoms is 38500. Here n is the number of hexagons.`
	CROSSREFS	`Sequence in context: A230816 A174646 A092699 * A102188 A225601 A126135` `Adjacent sequences: A121972 A121973 A121974 * A121976 A121977 A121978`
	KEYWORD	`nonn`
	AUTHOR	`Parthasarathy Nambi, Sep 05 2006`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 7 03:27 EST 2019. Contains 329836 sequences. (Running on oeis4.)