A124004 Number of possible Reversi games at the end of the n-th ply.

1, 4, 12, 56, 244, 1396, 8200, 55092, 390216, 3005288, 24571056, 212258216, 1939879668, 18429618408, 184041761768, 1891831332208, 20301171282452, 222742563853912, 2534535926617852, 29335558770589276, 349980362625040712, 4228388321175157140

Offset

0,2

Comments

Reversi is the older name for the game. Othello is a more recent trade name.

Links

Table of n, a(n) for n=0..21.

Alain Brobecker, Othello and retrograde analysis (pdf)

Alain Brobecker, programs to generate sequences

Alain Brobecker, othello.c

Dominic Hofer, documentation and project to generate sequence

Crossrefs

Cf. A124005, A124006.

Sequence in context: A149423 A295496 A164575 * A243785 A019266 A009114

Adjacent sequences: A124001 A124002 A124003 * A124005 A124006 A124007

Keyword

fini,hard,nonn

Author

Alain Brobecker (abrobecker(AT)yahoo.com), Nov 01 2006, Dec 30 2006

Extensions

a(15)-a(18) from Paul Byrne, Mar 08 2008

Edited by Charles R Greathouse IV, Oct 28 2009

a(19) from Dominic Hofer, Oct 21 2014

a(20) from Dominic Hofer, Jan 11 2021

a(21) from Dominic Hofer, Feb 11 2021

Status

approved