A368001 - OEIS

A368001

a(n) is the denominator of the probability that a particular one of the A335573(n+1) fixed polyominoes corresponding to the free polyomino with binary code A246521(n+1) appears as the image of a simple random walk on the square lattice.

1, 2, 6, 6, 21, 21, 28, 21, 21, 2002, 77, 77, 77, 1001, 77, 77, 1001, 1001, 77, 91, 77, 89089, 785603, 286, 286, 48594, 286, 25924899, 194194, 785603, 194194, 25924899, 286, 89089, 286, 388388, 194194, 286, 51849798, 388388, 194194, 286, 286, 194194, 286, 388388, 286, 286, 194194, 388388, 194194, 286, 388388, 1165164, 291291, 286

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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.

LINKS

Table of n, a(n) for n=1..56.

Index entries for sequences related to polyominoes.

FORMULA

A368000(n)/a(n) = (A367994(n)/A367995(n))/A335573(n+1).

EXAMPLE

As an irregular triangle:

6, 6;

21, 21, 28, 21, 21;

2002, 77, 77, 77, 1001, 77, 77, 1001, 1001, 77, 91, 77;

...