A246889 Number of length n+4 0..5 arrays with some pair in every consecutive five terms totalling exactly 5.

6210, 33294, 177648, 942216, 4971120, 26346486, 139555230, 738947844, 3912529200, 20719113168, 109715387730, 580975750422, 3076449953280, 16290853187184, 86265445976256, 456803864051526, 2418927144356598

Offset: 1

Author

R. H. Hardin, Sep 06 2014

Keywords

• nonn

Comments

Column 5 of A246892

Examples

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

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +7*a(n-2) +19*a(n-3) +53*a(n-4) -40*a(n-5) -36*a(n-6) -24*a(n-7) -64*a(n-8) +16*a(n-9) +29*a(n-10) -3*a(n-11) +5*a(n-12) +a(n-13) -a(n-14)