OFFSET
4,2
COMMENTS
First differs at a(7)=404 from A323700(7)=406, because there are two walks of length 7 trapped at both ends. If seen as unrooted walks, their path shapes become identical after path reversal and reflection.
LINKS
Hugo Pfoertner, Illustrations of uncrossed knight's walks trapped after n moves, (2019).
Hugo Pfoertner, Probability density for the number of moves to self-trapping, (2019).
EXAMPLE
In algebraic chess notation, the two walks double counted in A323700(7) are
N c4 d2 e4 c5 a4 b2 d1 c3 and N d4 c2 e3 d5 b4 a2 c1 b3.
CROSSREFS
KEYWORD
nonn,walk,hard,more
AUTHOR
Hugo Pfoertner, Jan 24 2019
STATUS
approved