The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A192827 Molecular topological indices of the gear graphs 1
 11, 88, 231, 440, 715, 1056, 1463, 1936, 2475, 3080, 3751, 4488, 5291, 6160, 7095, 8096, 9163, 10296, 11495, 12760, 14091, 15488, 16951, 18480, 20075, 21736, 23463, 25256, 27115, 29040 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Gear graphs are defined for n>=3; extended to n=1 using closed form LINKS G. C. Greubel, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Gear Graph Eric Weisstein's World of Mathematics, Molecular Topological Index Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 11*n*(3*n-2). a(n) = 11*A000567(n). G.f.: 11*x*(1+5*x)/(1-x)^3. - Colin Barker, Nov 04 2012 E.g.f.: 11*x*(1+3*x)*exp(x). - G. C. Greubel, Jan 03 2019 MATHEMATICA Table[11n(3n-2), {n, 40}] (* or *) LinearRecurrence[{3, -3, 1}, {11, 88, 231}, 40] (* Harvey P. Dale, Dec 21 2018 *) PROG (PARI) a(n)=11*n*(3*n-2) \\ Charles R Greathouse IV, Jun 17 2017 (Magma) [11*n*(3*n-2): n in [1..40]]; // G. C. Greubel, Jan 03 2019 (Sage) [11*n*(3*n-2) for n in (1..40)] # G. C. Greubel, Jan 03 2019 CROSSREFS Cf. A000567. Sequence in context: A001278 A125304 A334249 * A022735 A346448 A173731 Adjacent sequences: A192824 A192825 A192826 * A192828 A192829 A192830 KEYWORD nonn,easy AUTHOR Eric W. Weisstein, Jul 11 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)