A246898 Number of length 6+4 0..n arrays with some pair in every consecutive five terms totalling exactly n

802, 48393, 643204, 5592169, 26346486, 107053441, 319477960, 884303793, 2058978250, 4577948761, 9125970252, 17627483353, 31593727774, 55331109009, 91774208656, 149536831201, 233808185970, 360429285673, 537940839700

Offset

1,1

Comments

Row 6 of A246892

Links

R. H. Hardin, Table of n, a(n) for n = 1..63

Formula

Empirical: a(n) = 2*a(n-1) +6*a(n-2) -14*a(n-3) -14*a(n-4) +42*a(n-5) +14*a(n-6) -70*a(n-7) +70*a(n-9) -14*a(n-10) -42*a(n-11) +14*a(n-12) +14*a(n-13) -6*a(n-14) -2*a(n-15) +a(n-16)

Example

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

Crossrefs

Sequence in context: A075005 A249007 A249472 * A205050 A202586 A204836

Adjacent sequences: A246895 A246896 A246897 * A246899 A246900 A246901

Keyword

nonn

Author

R. H. Hardin, Sep 06 2014

Status

approved