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

Author

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

Keywords

• fini
• hard
• nonn

Comments

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

Links

• 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.

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