login
A249889
Number of length 6+6 0..n arrays with no seven consecutive terms having the maximum of any three terms equal to the minimum of the remaining four terms
1
35, 12053, 785512, 19280050, 251933535, 2134932975, 13234666552, 64864288932, 264892845123, 935317626473, 2933310313328, 8337179912854, 21810111432655, 53153742532419, 121854226946064, 264833970134344, 549186726272259
OFFSET
1,1
COMMENTS
Row 6 of A249883
LINKS
FORMULA
Empirical: a(n) = n^12 - (1129/770)*n^11 + (13667/1575)*n^10 - (1901/270)*n^9 + (28967/1260)*n^8 - (3352/315)*n^7 + (1283/100)*n^6 + (4261/210)*n^5 - (18491/630)*n^4 + (1051/54)*n^3 + (2132/1575)*n^2 - (2391/770)*n
EXAMPLE
Some solutions for n=2
..2....2....2....1....2....1....2....0....2....1....0....0....0....2....0....1
..1....2....1....1....2....2....2....1....0....0....0....0....0....0....2....1
..0....1....2....2....1....0....2....0....0....2....0....2....1....1....0....1
..2....2....0....0....0....0....0....1....1....2....1....2....2....1....2....0
..1....0....1....0....0....1....2....2....2....1....1....0....2....0....2....0
..0....0....0....1....1....1....0....0....1....2....2....2....2....0....0....0
..0....2....0....0....0....0....0....2....0....2....1....1....0....1....2....1
..2....0....1....2....1....1....1....0....2....0....0....0....0....1....1....1
..1....2....1....2....2....1....2....1....0....0....0....0....2....0....0....2
..0....2....2....2....1....0....2....0....0....2....0....1....1....1....2....1
..1....2....0....2....0....0....0....2....2....0....2....2....0....2....2....0
..1....1....1....1....0....2....2....1....2....2....1....0....2....0....0....0
CROSSREFS
Sequence in context: A316940 A202066 A271071 * A030261 A345675 A007102
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 07 2014
STATUS
approved