A209739 Number of n X 3 0..5 arrays with every 2 X 2 subblock containing exactly one value repeat, and new values 0..5 introduced in row major order.

5, 57, 2025, 103373, 6262064, 404495219, 26715084257, 1777603386801, 118573281463225, 7915782848604211, 528589085007311295, 35300530985616790273, 2357529150039721810029, 157447991892723989479547

Offset: 1

Author

R. H. Hardin Mar 12 2012

Keywords

• nonn

Comments

Column 3 of A209744.

Examples

			Some solutions for n=5
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..1..2..1....1..2..3....1..2..1....1..2..1....1..2..1....1..2..1....1..2..1
..0..0..0....3..1..1....1..0..0....0..0..1....3..3..1....2..0..0....3..3..2
..1..3..4....4..3..0....1..2..3....1..2..1....0..1..2....0..3..4....2..4..2
..1..5..3....5..3..1....0..0..3....0..0..0....0..3..1....0..5..4....0..0..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A209744.

Formula

Empirical: a(n) = 100*a(n-1) -2365*a(n-2) +6020*a(n-3) +291532*a(n-4) -2681320*a(n-5) +4701820*a(n-6) [phone]*a(n-7) -82586672*a(n-8) [phone]*a(n-9) [phone]*a(n-10) -78159872*a(n-11) +7864320*a(n-12) for n>13.