A367765 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 in the Eden growth model on the square lattice (see A367760), when n square cells have been added.

1, 2, 6, 6, 24, 6, 16, 24, 24, 20, 120, 120, 120, 480, 120, 120, 480, 480, 120, 40, 120, 1800, 4800, 720, 720, 1200, 720, 7200, 384, 4800, 384, 7200, 720, 1800, 720, 320, 384, 720, 7200, 320, 384, 720, 720, 384, 720, 320, 720, 720, 384, 320, 384, 720, 320, 1920, 1440, 720

Offset: 1

Author

Pontus von Brömssen, Dec 02 2023

Keywords

• nonn
• frac
• tabf

Comments

Can be read as an irregular triangle, whose n-th row contains A000105(n) terms, n >= 1.

Examples

			As an irregular triangle:
   1;
   2;
   6,   6;
  24,   6,  16,  24,  24;
  20, 120, 120, 120, 480, 120, 120, 480, 480, 120, 40, 120;
  ...
		

Links

• Index entries for sequences related to polyominoes.

Crossrefs

Cf. A000105, A246521, A335573, A367676, A367760, A367761, A367764 (numerators), A367767.

Formula

A367764(n)/a(n) = (A367760(n)/A367761(n))/A335573(n+1).