OFFSET
1,2
COMMENTS
In a simple random walk on the square lattice, draw a unit square around each visited point. A368000(n)/a(n) is the probability that, when the appropriate number of distinct points have been visited, the drawn squares form a particular one of the fixed polyominoes corresponding to the free polyomino with binary code A246521(n+1).
Can be read as an irregular triangle, whose n-th row contains A000105(n) terms, n >= 1.
EXAMPLE
As an irregular triangle:
1;
2;
6, 6;
21, 21, 28, 21, 21;
2002, 77, 77, 77, 1001, 77, 77, 1001, 1001, 77, 91, 77;
...
CROSSREFS
KEYWORD
nonn,frac,tabf
AUTHOR
Pontus von Brömssen, Dec 09 2023
STATUS
approved