54597

Appears in sequences

• Number of configurations of the 5 X 2 variant of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square in one of the corners.at n=28A090036
• G.f. A(x) satisfies: A(x) = Sum_{n>=0} ((1+x)^n - 1)^n / A(x)^n.at n=6A303057
• a(0)=0, a(n) = 2*(a(n-1) + ceiling(n/2)) - 1 for n>0.at n=15A380384