OFFSET
0,2
COMMENTS
Sum of all 43 terms is 4531985219092 as computed by Edelkamp and Kissmann (see link).
LINKS
John Tromp, Table of n, a(n) for n = 0..42 (copied from the P. Kissmann link)
Dennis Aanstoot, Graph rewriters as components, Univ. of Twente (Netherlands, 2022).
S. Edelkamp and P. Kissmann, Symbolic Classification of General Two-Player Games
Brady Haran, Connect Four, Numberphile video, 2013.
Johannes Niklas Hartmann, Finding optimal strategies in sequential games with the novel selection monad, arXiv:2105.12514 [cs.AI], 2021.
P. Kissmann, Algorithm Engineering - Symbolische Suche [broken link]
John Tromp, John's Connect Four Playground
EXAMPLE
a(3) = 7 * (1*7 + 6*(5/2 + 2)) = 238 because 3 discs played in different columns can be transposed in two ways.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
John Tromp, May 23 2012
STATUS
approved