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

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

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

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

Adjacent sequences: A249883 A249884 A249885 * A249887 A249888 A249889

Keyword

nonn

Author

R. H. Hardin, Nov 07 2014

Status

approved