The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A007780 Losing initial configurations in 2-hole Tchuka Ruma. 2
 1, 2, 3, 6, 9, 11, 18, 20, 27, 30, 54, 81, 162, 168, 243, 486, 729, 1458, 2187, 4374, 6561, 13122, 19683, 39366, 59049, 118098, 177147, 354294, 531441, 1062882, 1594323, 3188646, 4782969, 9565938, 14348907, 28697814, 43046721, 86093442 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The 2-hole Tchuka Ruma game cannot be won for the initial seeds 3^i (i>=1) or 2*3^i (i>=0). Though a sufficient condition, this is not necessary, as can be seen from the terms a(6)=11, a(8)=20, a(10)=30 and a(14)=168. - Pab Ter (pabrlos2(AT)yahoo.com), Nov 08 2005 If any further sporadic term exists, then it exceeds 6973568802. - Sean A. Irvine, Jan 25 2018 LINKS Sean A. Irvine, Table of n, a(n) for n = 1..46 Paul J. Campbell, and Darrah P. Chavey, Tchuka Ruma Solitaire, The UMAP Journal 16(4) (1995), 343-365. FORMULA Conjectures from Colin Barker, Jan 25 2018: (Start) G.f.: x*(1 + 2*x - 7*x^5 - 9*x^6 - 13*x^7 - 27*x^8 - 30*x^9 - 27*x^10 - 9*x^11 - 75*x^13 - 243*x^14 - 18*x^15) / (1 - 3*x^2). a(n) = 3*a(n-2) for n>2. (End) CROSSREFS Sequence in context: A176189 A057127 A224449 * A018537 A018331 A032704 Adjacent sequences:  A007777 A007778 A007779 * A007781 A007782 A007783 KEYWORD nonn AUTHOR EXTENSIONS More terms from Pab Ter (pabrlos2(AT)yahoo.com), Nov 08 2005 More terms from Sean A. Irvine, Jan 25 2018 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 9 14:23 EDT 2020. Contains 336323 sequences. (Running on oeis4.)