A250158 Number of length 4+6 0..n arrays with every seven consecutive terms having the maximum of some two terms equal to the minimum of the remaining five terms

654, 20513, 240144, 1611449, 7601062, 28153337, 87461488, 237724881, 581746318, 1307985393, 2742532640, 5423404233, 10203578438, 18390302857, 31929395744, 53644545313, 87542977998, 139200320065, 216239016816, 328916299865

Offset

1,1

Comments

Row 4 of A250154

Links

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

Formula

Empirical: a(n) = (5/21)*n^9 + (127/21)*n^8 + (251/7)*n^7 + (911/10)*n^6 + (684/5)*n^5 + (325/2)*n^4 + (3047/21)*n^3 + (6967/105)*n^2 + (946/105)*n + 1

Example

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

Crossrefs

Sequence in context: A255208 A060520 A250701 * A265737 A065759 A280445

Adjacent sequences: A250155 A250156 A250157 * A250159 A250160 A250161

Keyword

nonn

Author

R. H. Hardin, Nov 13 2014

Status

approved