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A193125 Number of molecular topological index-nonunique connected simple graphs on n nodes. 0
0, 0, 0, 2, 12, 87, 815, 11086, 261042 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..9.

Eric Weisstein's World of Mathematics, Molecular Topological Index

EXAMPLE

The paw graph and square graph C_4 both have MTI = 48, while all other 4-node connected simple graphs have unique MTI values, so a(4) = 2.

CROSSREFS

Sequence in context: A305209 A290568 A181345 * A305868 A319324 A059435

Adjacent sequences:  A193122 A193123 A193124 * A193126 A193127 A193128

KEYWORD

nonn,hard,more

AUTHOR

Eric W. Weisstein, Jul 16 2011

STATUS

approved

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Last modified September 19 08:05 EDT 2021. Contains 347556 sequences. (Running on oeis4.)