A246743 Number of length 6+4 0..n arrays with no pair in any consecutive five terms totalling exactly n

2, 52, 5132, 52112, 807630, 4791012, 31944440, 130526848, 540366650, 1692606260, 5207709252, 13469585232, 33976308422, 76317563812, 167224561520, 337577831552, 666340346610, 1237996390068, 2255112904700, 3921870847120

Offset

1,1

Comments

Row 6 of A246737

Links

R. H. Hardin, Table of n, a(n) for n = 1..60

Formula

Empirical: a(n) = 3*a(n-1) +5*a(n-2) -23*a(n-3) -4*a(n-4) +76*a(n-5) -28*a(n-6) -140*a(n-7) +98*a(n-8) +154*a(n-9) -154*a(n-10) -98*a(n-11) +140*a(n-12) +28*a(n-13) -76*a(n-14) +4*a(n-15) +23*a(n-16) -5*a(n-17) -3*a(n-18) +a(n-19)

Example

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

Crossrefs

Sequence in context: A246485 A340837 A121293 * A057106 A080973 A230882

Adjacent sequences: A246740 A246741 A246742 * A246744 A246745 A246746

Keyword

nonn

Author

R. H. Hardin, Sep 02 2014

Status

approved