Map folding ($2 \times 9)$
The number of distinct ways to fold a $2 \times 9$ rectangle into a unit square.
Value: $1787904$ (1,787,904)
Updates
-
Lower bound: $1787904$
(1,787,904)
Reference unknown
[via Number of ways of folding a 2 X n strip of stamps. - OEIS] -
Upper bound: $1787904$
(1,787,904)
Reference unknown
[via Number of ways of folding a 2 X n strip of stamps. - OEIS]