Number of possible chess games at the end of the n-th ply plus number of games that terminate (i.e., mate) in fewer than n plies.

A006494

Number of possible chess games at the end of the n-th ply plus number of games that terminate (i.e., mate) in fewer than n plies.

Terms

    a(0) =1a(1) =20a(2) =400a(3) =8902a(4) =197281a(5) =4865617a(6) =119060679a(7) =3195913043a(8) =84999425906

External references