A249289 Number of length n+3 0..7 arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth

3584, 25280, 178644, 1263044, 8930228, 63142432, 446465388, 3156873140, 22321652802, 157832259724, 1116002868810, 7891051581722, 55796177670214, 394524535750878, 2789610622867354, 19724825025520940, 139470619655277052

Offset

1,1

Comments

Column 7 of A249290

Links

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

Example

Some solutions for n=3
..2....6....5....2....4....0....4....0....0....4....6....0....0....2....2....2
..6....7....6....1....5....5....0....5....2....6....3....3....5....2....6....3
..6....5....2....4....4....2....6....1....4....3....1....0....6....7....3....0
..6....7....6....0....2....0....7....4....5....1....4....7....5....7....0....6
..5....6....5....7....3....4....7....3....6....7....3....3....6....5....7....5
..5....7....2....3....5....3....0....1....3....7....0....1....0....5....4....0

Crossrefs

Sequence in context: A246855 A252153 A234138 * A249537 A156845 A174851

Adjacent sequences: A249286 A249287 A249288 * A249290 A249291 A249292

Keyword

nonn

Author

R. H. Hardin, Oct 24 2014

Status

approved