A246733 Number of length n+4 0..4 arrays with no pair in any consecutive five terms totalling exactly 4.

424, 1096, 2884, 7612, 19992, 52112, 135776, 354428, 926912, 2426008, 6344712, 16581304, 43323852, 113217276, 295956684, 773719596, 2022600900, 5286817120, 13818445276, 36118847720, 94411371892, 246786721208, 645084592792

Offset: 1

Author

R. H. Hardin, Sep 02 2014

Keywords

• nonn

Comments

Column 4 of A246737

Examples

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

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +a(n-4) +24*a(n-5) +2*a(n-6) +5*a(n-7) +11*a(n-8) -8*a(n-10) -2*a(n-11) +3*a(n-12) +a(n-15) +a(n-16)