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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A288637 Number of cycles in the grid graph P_4 X P_{n+1}. 3
 6, 40, 213, 1049, 5034, 23984, 114069, 542295, 2577870, 12253948, 58249011, 276885683, 1316170990, 6256394122, 29739651711, 141366874247, 671984773580, 3194266961582, 15183887824311, 72176324719925, 343088799809408, 1630866146364842, 7752291502484181 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..200 Eric Weisstein's World of Mathematics, Graph Cycle Eric Weisstein's World of Mathematics, Grid Graph FORMULA Empirical: a(n) = 9*a(n-1)-27*a(n-2)+38*a(n-3)-29*a(n-4)+11*a(n-5)+a(n-6)-2*a(n-7) for n>7. Empirical g.f.: x*(6 - 14*x + 15*x^2 - 16*x^3 - 2*x^4 + x^5) / ((1 - x)^2*(1 - 7*x + 12*x^2 - 7*x^3 + 3*x^4 + 2*x^5)). - Colin Barker, Jun 12 2017 CROSSREFS Row 3 of A231829. Sequence in context: A292029 A227124 A232568 * A059021 A229580 A254945 Adjacent sequences: A288634 A288635 A288636 * A288638 A288639 A288640 KEYWORD nonn AUTHOR Andrew Howroyd, Jun 12 2017 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 August 7 08:03 EDT 2024. Contains 375008 sequences. (Running on oeis4.)