This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A192836 Molecular topological indices of the pan graphs. 1
 14, 29, 48, 83, 126, 193, 272, 383, 510, 677, 864, 1099, 1358, 1673, 2016, 2423, 2862, 3373, 3920, 4547, 5214, 5969, 6768, 7663, 8606, 9653, 10752, 11963, 13230, 14617, 16064, 17639, 19278, 21053, 22896, 24883, 26942, 29153, 31440, 33887, 36414, 39109, 41888 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Pan graphs are defined for n>=3; extended to n=1 using closed form. LINKS Colin Barker, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Molecular Topological Index Index entries for linear recurrences with constant coefficients, signature (2,1,-4,1,2,-1). FORMULA a(n) = (1/4)*(26+27*n+4*n^2+2*n^3+(-1)^n*(2+n)). G.f. -x*(7*x^5-14*x^4-14*x^3+24*x^2-x-14)/((x-1)^4*(x+1)^2). - Colin Barker, Aug 07 2012 PROG (PARI) Vec(-x*(7*x^5-14*x^4-14*x^3+24*x^2-x-14) / ((x-1)^4*(x+1)^2) + O(x^100)) \\ Colin Barker, Jan 23 2017 CROSSREFS Sequence in context: A257645 A046045 A132756 * A124681 A195145 A263119 Adjacent sequences:  A192833 A192834 A192835 * A192837 A192838 A192839 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 20 08:16 EST 2018. Contains 317385 sequences. (Running on oeis4.)