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A249886
Number of length 3+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, 2335, 46460, 463880, 2967275, 13967995, 52655600, 167876760, 469717035, 1183918175, 2739855580, 5905755440, 11988148835, 23116240715, 42635915200, 75642505040, 129686222355, 215689279935, 349119227420, 551468884600
OFFSET
1,1
COMMENTS
Row 3 of A249883
LINKS
FORMULA
Empirical: a(n) = n^9 + (9/7)*n^8 + (100/21)*n^7 + (20/3)*n^6 + (59/6)*n^5 + (91/12)*n^4 + (5/3)*n^3 + (55/28)*n^2 + (5/21)*n
EXAMPLE
Some solutions for n=3
..2....2....3....2....2....0....0....2....3....2....2....0....1....3....0....0
..0....2....2....0....0....1....0....1....0....3....1....0....0....0....3....3
..3....0....0....0....0....2....2....0....0....1....3....3....1....1....0....0
..2....0....2....3....3....0....0....0....3....0....0....0....3....0....3....1
..0....3....2....1....2....3....2....2....1....2....3....3....3....3....2....1
..3....1....1....2....3....3....1....0....3....3....1....1....3....2....0....0
..1....3....1....0....0....2....1....3....2....0....3....3....2....3....3....1
..2....3....3....2....1....0....0....1....0....3....2....2....0....0....0....0
..0....0....3....0....2....1....0....3....2....0....1....3....0....3....1....1
CROSSREFS
Sequence in context: A094187 A202921 A215291 * A290584 A174749 A184124
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 07 2014
STATUS
approved